Help me pick a PSU. Best PSU for under 100?

Hey guys, i need some pro help.

I'm on a tight budget for this next comp and I
will build as soon as the new 45nm chips are launched....

first time building and i've picked everything out except the PSU...
and i was wondering what is the best PSU i can get for around 100???
I've checked the tier listing and did some price checks, but prices vary so much within tiers
and i'm really confused about the wattage and i don't want to buy something i wont really need.

I'd prefer to spend around $75, but will go up to $100.

Comp specs look like this:

Q9450 or (Q6600 at worse)
2-4Gigs of ram
8800GT or 38xx (or close)
GA-P35-DSR3

So all help right now would be appreciated! Thanks!