Which Intel I5???

Ah this old question again, depends if you want to overclock or not, and what chipset you've got (Z77 for OC'ing)

But I'd go for the i5 3570k - http://www.amazon.co.uk/dp/B007RUZKK6/ref=asc_df_B007RU...

Clocked to 3.4GHz and easily overclockable to 4GHz, though that may need an aftermarket cooler to keep it at a nice temperature.
If you don't want to concern with OC'ing go for the 3570, 'K' means that model has an unlocked multiplier ready to overclock.

It's a powerful CPU great for gaming and anything else, simple quad core with no HyperThreading, so not optimized for encoding and the like, but it will serve you well for around £160-ish.

What about thw 2550k?

The 2550k is a viable option, as is the 2500k, but with the 3570k being Ivy Bridge, the clock for clock performance is around 7% better.
The 2550k has no integrated GPU, which may or may not be a problem depending on if you use integrated GPU's, which for gaming is not recommended.

Though the 3570k would probably be a better option regardless, though the Sandy Bridge will OC slightly better in some cases, and maintain lower temps.

any idea for a motherboard will also use your refferal link

A good solid reliable motherboard for LGA1155 would be an ASRock z77 Extreme4 for about £100- ish

http://www.amazon.co.uk/dp/B007KTY4A6/ref=asc_df_B007KT...

Very good reviews, and a very popular board, also one that I'm using for my next build.

i7 3770 (not the K version) and Asrock B75 PRO 3. If money isn't a problem get an i7, the extra grunt will come in handy.

I don't think any games really use hyperthreading so getting an i7 is more or less a waste of money for gaming purposes.

Get the ASRock Mobo that Noodl suggested and an i5 3570k and a Hyper 212 evo cpu cooler($20-$30) and OC it to 4.2GHz Imo.

i just noticed that intel i5 3570k is the same price as intel i5 3570
so which one should i get now

They are both exactly the same, unless you overclock, in which case the 3570k is better. It is a no brainer get the 3570k.

Hi,

get the 2550k if you want to overclock with stock cooler (mine is fine @ 4 ghz, at around 60-65 degree full load on my build)

i5 3570k if you don't overclock or get another cooler for proper overclock (better than 2550k)

Not a total waste - more cache and a higher boost speed. And Hyperthreading is there if you need it. More grunt always helps. And a 4.2GHz 3570K compared to a stock 3770 is irrelevant in any game anyway with a decent card behind it.

That is not true... If you play CPU intensive games(such has heavy populated MMOS, BF3 multiplayer, and starcraft 2 ) the overclocked i5 will out perform a stock 3770 by up to 30% given that your GPU can also push those FPS.

Three examples? Irrelevant. Generally single player games won't take advantage of heavy overclocking.

Three examples?? pretty much all MMOs = hundreds of games right there... Ok you win if he only plays single player games that don't require a good CPU ( so laughable your logic is ) then yes it won't matter what cpu he uses...

Ill just chime in and say +1 for the 3570k best gaming cpu for your money at the moment overclock or not, cant go wrong, wont bottleneck any system you decide to build unless you plan to quad sli gtx 680's. the i7 as said would be money thrown in the bin, just get an ssd for the money instead ( :