Re: better graphix card
The 6600GT is better than the 7300. When it says "up to," that means it uses hyper memory. I think it has something like 128MB onboard, but after that it drains your computer's main RAM to give it to the graphics card. You really want to avoid the whole process. Also, the 6600GT has more pixel processors with a higher core clock speed, and a 128-bit memory interface with a higher memory clock speed. The lower-end 7300s (i.e. the 7300GS and LE) have a 64-bit memory interface with a low clock speed, plus just DDR2 as opposed to the 6600GT's GDDR3. There would be no reason to stick with the 7300 if you have the 6600GT already, assuming the 6600GT is compatible.
If you can upgrade, a 7600GT would be a great budget choice. If you've got a little more to blow, a 7900GS or a Radeon X1950PRO will do nicely.
ASUS A8N32 SLI-Deluxe, AMD Athlon X2 3800+ @ 2.8GHz, eVGA 8800GTS 320MB, 2GB Corsair XMS DDR400, 160GB WD HDD + 320GB Seagate Barracuda 7200.10, AC Freezer 64 Pro, 700W OCZ GameXStream, NZXT Zero :D
I think I've decided to leave... maybe I'll come back sometime.