I wouldn't worry about getting a 750W PSU. unless you can find one for the same price/slightly more than a 650W PSU. You hit the nail right on the head with the 4870, it will suit you very well for gaming on your 22". Unfortunately, should you hook it up to your TV and play at 1920x1080, you won't be able to play on max settings with AA, you'll have to turn down the settings to get decent framerates. If you want to play games now on your 22" with good framerates and play games a year down the road on your 22" with good framerates, then the 4870 is for you. Don't bother with the 4850, there's an
XFX 4870 for $280 at Newegg, and an
HIS 4870 for $238 before $20 MIR at Newegg as well
As for a good 4GB kit of RAM, pretty much any kit will do. Personally, I'm a Mushkin fan, so I'll post up some good links for them. Let's see... there's some
DDR2-800 with CL5 timings for $56, or
this set with CL4 timings. Alternatively, you can get this good
Redline DDR2-1000 kit, or if you like fancy heat spreaders and fairly cool RAM, then there's the
Mushkin Ascent DDR2-1000. Then for that extra little speed boost, you can get this sert of
DDR2-1066, and if you like the funky heatsink, there's the
Mushkin Ascent DDR2-1066 which run fairly cold because of the funky heatspreaders. BTW you can always pricematch on NCIX if you don't trust a retailer or don't want to pay shipping if you can pick it up =D
As for the Hard Drive, the
WD Caviar Black 640GB for $88 always pleases with its speed but doesn't punish with its price.
And a DVD drive, if you can stomach $35 then there's the
LG GH22NS30 that burns and reads everything except blu-ray at great speeds.