What PSU do you recommend and why?

EVGA Supernova G/P/T2 850 watt.
Tier 1 highest quality. 10 year warranty. the G/P/T2 is one of the best PSU units you can buy.

This is the Toms tier listing for power supplies. I suggest buying off the tier 1 list. tier 2 is also very good, but the best are on the top. The decade warranty is the reason I suggest the supernova G2/P2/T2.

G2 gold efficiency
P2 platinum efficiency
T2 titanium efficiency

that is the T2 it is more efficient than the G2 but is built on the same platform/design.

http://www.newegg.ca/Product/Product.aspx?Item=N82E16817438018&cm_re=g2_850-_-17-438-018-_-Product
I do not think the difference is worth the massive price difference. The G2 would be my choice

That's kinda like asking me to recommend "some place to eat" without telling me budget, components, or food preferences.

What are your goals ? Stock, moderate OC (EVGA B2), "bawlz to the wall" OC ? Seasonic Snow / EVGA P2

What is your load ? as the 860 properly sized ?

I generally don't recommend tier lists because they contain too many inconsistencies where a while model lines gets in a tier based upon 1 review even when other sizes in that line have different OEMs or platforms.

Like anything else, your PSU quality should match the relative quality of your other components ...

6700k w/ twin 1080s, custom water loop and looking for extreme overclock and low noise, I'd use a 1050 watt Seasonic Snow Edition

Switch to twin 970s , high overclock, OLC type water cooler (Swiftech H240-X), I'd do a 750 Snow.

6600k, moderate overclocking, twin 970s, EVGA 750 B2

6700k, single 1080, high over clock, EVGA P2 650

6600 single 1070, no overclocking Seasonic 520 S12

Why ?

1050 / 750 Snow - 10 Build Quality / 10 performance / Very low Noise
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=409

EVGA P2 - 10 Build Quality / 10 performance
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=444

EVGA B2 750 - 9 Build Quality / 9.5 performance / Low cost
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=393

Seasonic S12 - 9.5 Build Quality / Low cost
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=185

I do not think the extra 8-10% in efficiency are worth the extra hundred bucks.
they are both built upon the superflower leadex platform which is second to none.

all three supernova 2's G2,P2,T2 are made to the same quality and so they are all tier 1. you will not be let down by any of them.

Personally I don't give a hoot about Bronze, Silver, Gold, Platinum, Titanium. The only impact of the metal rating, is how much you pay for electricity. And unless you pay 20 hours a day and keep it for 5 years, you're not likely to get that money back. So is Titanium worth buying ? If ya Gold Rated PSU is already giving you a 10.0 Build Quality and / 10.0 Performance Rating, exactly what are you getting for that substantial \ price premium ?

EVGA T2 850 watts - 10 Build Quality / 9.5 performance ($190)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=462

EVGA P2 850 watts - 10 Build Quality / 10.0 performance ($145)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=444

EVGA G2 850 watts - 9.5 Build Quality / 10.0 performance ($95)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=377

So you'd spend twice and much for a T2 over a G2 to get a PSU that doesn't perform as well ?

Now granted any different unit off the line might perform better or even have better build quality but can you justify twice the price for something that might be 0.5 better ? Ad yes there are obviously real differences in the quality of the components used or all would deliver the same efficiency and get the same rating. But the question is, will it have an impact on your goals ?

It's primarily about 3 things:

1. In order to OC well, you need stable power. If your voltage is bouncing around as power draw varies, your system will have difficulty maintaining high stable OCs.

2. In order to maintain stable OCs, you don't want a lot of noise \ ripple.

3. If ya want to concentrate while working / playing with a minimum level of annoyance, you want the system to be quiet. My son has an EVGA G2 1000 and tho the system rarely draws over 600 watts, the PSU fan is the loudest thing in the box. Power is stable, OCs are good but the noise is a but of a drag.

There may be advantages to spending more, but it's kinds like buying a Ferrai because you are always late to work ... Having a speedometer that goes up to 180, doesn't get you to work any faster than most anything else when the speed limit is 55 mph and you stuck in 20 mph traffic during rush hour.

So if you are not very big into overclocking, there's no argument that I could make to justify spending more than $70 for an EVGA B2 series. And, no... there is no 8-10% performance increase for the T2 over the P2... more like 2%.

At 50% load, (peak efficiency):

T = 94%
P = 92%
G = 90%

Ya still haven't said what size... so lets say you go with a 750 and we're at 50% average load (very conservative) load 30 hours a week

375 watts x 30 hours, x 52 weeks x / 1,000 watts per kw =

Power Output = 585 kw / year

Power Input (Titanium) = 585 x $ 0.10 per kwh / 0.94 = $62.23 per year
Power Input (Gold) = 585 x $ 0.10 per kwh / 0.90 = $65.00 per year

Net savings = $2.77 per year

With a $100 price difference, your payback period is 34.3 years

I suggest getting more efficent pwoer supply if you can. By the electricity bill savings the psu will pay for itself.
As JackNaylorPE said, post your budget and pc specification. That way we can recommend you according to your need.

But, as you had a platinum power supply, i suggest get the EVGA P2 850w instead of G2. Has same warranty as the T2, 10 years.

Our tier list is becoming old and there are some misinformation.

I just realized I never gave you the link to the list. Keep in mind as others have stated the list is ageing, there are many PSU's not represented here, but it is still a good reference source.

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

he's in canada guys, the prices are a lot more the B2 850 is 117 a far cry from under 50 bucks.
the t2 in ca was 289
the g2 in ca was 179 - 20 rebate
the b2 in ca is 117
it is worth noting the B2 has a 3 year warranty

We still don't have any information from OP other than he needs a power supply.
G2 850w is $155 in canada, and has a 20 rebate in newegg.

He can also consider the Rosweill Quark - http://ca.pcpartpicker.com/product/R4Crxr/rosewill-power-supply-quark850