I've had good experiences with Antec. I have an Antec NeoPower 650 and in my other two PC's, I have Antec Truepower Trio 550's.
It's better to have more power than you actually need. Seasonic makes the NeoPower 650 and it's been reliable this past year. Here's the NeoPower 650 blue:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
The blue version wasn't out when I built my PC, so I have the older non LED version. It might have been too much with the Antec Nine Hundred case anyways!
To the OP, there are few manufacturer's of power supplies but many brand names. Getting 80 plus is good as is trying to find out who makes the PSU you're actually buying.
I've gone to Jonny Guru for PSU information in the past:
http://www.jonnyguru.com/
Here's their review of my current PSU:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
I bought mine based upon Anandtech's review, but though Jonny Guru only gave it a 7.5 out of 10, it's been a good model, built by Seasonic.
Just never open your PSU like they do. They know what they're doing. There are no user serviceable parts in a PSU.
My general question for the thread:
I'm considering upgrading to 750 or 850 watts just before upgrading to a Phenom II 920 or 940 (haven't decided which) and a 4850x2 or a 4870 1 gig (haven't decided which is best for 1920 x 1080 gaming on an Acer H213H 20.5 LCD)
I'll use the same motherboard as it has a bios that supports Phenom II
Here are my two choices at Newegg:
750 watt Corsair for $124 or 850 watt for $139
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
850 watt Antec TPQ bronze certified:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Just not sure if bronze certified makes any difference. Does anyone think I don't need to upgrade the PSU? I'll play "musical PSU's" and move the 650 NeoPower to the next PC down and retire the oldest (by a year) 550 watt Truepower as an emergency backup if I do upgrade.