Re: Good power supply brands
While there are many PSU manufacturers out ther these are my top 3 picks based on first hand and third hand knowledge from word of mouth and reviews.
One of the best PSU brands around would have to be seasonic they make the most quietest, efficient (heat and voltage drop across rails under load), coolest (temp wise) and environmentally friendly power supplies around. With over 80% efficiency. Few manufactures come close.
Seasonic's site
Seasonic PSU's on newegg
You will be paying a premium for this though and they hard to find if you are not buying online.
If you want a good quality reasonable priced PSU then I recommend any PSU's made by Antec
Antec's Site
Antec PSU's on newegg
If you are into "bling" then maybe you could consider getting a PSU made by the company ULTRA. They also make a number of good modular power supplies. To answer your question ULTRA PSU's are fine.
Ultra's Site
ULTRA PSU's on Newegg
One thing you need to consider when buying a PSU is how much wattage do it need? Use this site to calculate the number of watts you need to power your PC http://extreme.outervision.com/. Basically unless you are running one of the new directx 10 cards (8800's) or a top of the line directx 9 setup (7900's) then a 500-600w PSU is enough.
Another thing you may want to consider when buying a PSU is getting a modular power supply. A modular PSU is where you can choose what cables you do and don't want as the cables plug into the PSU and the device they are powering.
My recommendation would be to buy a Seasonic PSU
Hope this helps.
Re: Good power supply brands
From first hand experience I'd say go with a Seasonic 650W. Quiet and no problems running an 8800GTX, future proof =]