[Pc_Support] Appropriate PSU for Socket 754 and 6600GT AGP?

[Jason Boxman]

I'm looking at PSUs on newegg and, like cases, you have about 200 choices.  
I'm focusing on the ones that actually have at least 10 reviews and 
immediately discarding any that mention DoA or serious reliability issues.

I am curious what would be adequate ratings for the 3.3, 5, and 12 rails?

Should I buy a dual +12V rail PSU?  Few on newegg have any reviews at all, so 
they're apparently not that popular yet.  The dual +12V PSUs I looked at 
boasted lower +5V and +3.3V ratings, around say 20A, versus the single +12V 
PSUs that generally have > 20A on those rails.

What's a reasonable efficiency level?

I'm definitely going to get one with 24-pin ATX and SATA power connectors for 
future expansion, so I want this to be a PSU I'll have for several years into 
the future.  (The Socket 754 board I get probably won't have 24-pin, although 
I haven't chosen a final candidate yet.)

Thanks.