EDIT: Bebpo, one prob: you have DDR1 memory (you said PC3200...) in your Athlon setup. Anything even relatively new uses DDR2 or even DDR3. Sorry man, but you'll have to toss the memory to move up. (The good news is that a 2GB stick is under $30. 2x2GB? $50.)
SRG01 said:
If you're getting a Phenom II, buy the X3 720. The 940 is terrible value when the X3 720 has more L3 Cache and overclocks about the same.
Except that the combo price is what, $30 more? I'd take the quad core 3GHz stock for that minimal price difference.
Bebpo, I have to admit, your 4000+ is really CPU constrained. I would in fact rather do the Phenom II + 9800 over just upgrading your video. I just went from a Athlon 64 X2 4200 to a Core 2 Quad Q600, and the difference has been pretty massive, even before I swapped out the video. You don't really need to go hardcore on the CPU upgrade, but definitely follow the Phenom II or Core 2 paths.
Are you dead set on the 9800? The GTS250 is out shortly (March 10, apparently?); it's essentially a shorter 9800GTX+ with lower power requirements and a ~$150 USD price tag, and at worst it might lower the price of a vanilla 9800. I'd much rather have a GTX260 though.
Either way, it's pretty amazing how much better a newer rig can be for HT purposes; your CPU should be great with general codec support, but the real highlight to me has been CUDA; honestly only TMPGenc and Badaboom are of any interest to me right now, but hell, Badaboom is doing transcodes (even MKV!) from 720p to 480p at 60-250+fps easily depending on the content (ie: anime transcodes a hell of a lot faster than standard video).
Bebpo said:
I'm running XP. Is there any reason I should upgrade to Vista for gaming? I know it has DX10.0, but I haven't been impressed enough with DX9 vs. DX10 examples to upgrade an operating system, especially one that eats up more ram just for it.
Stick with XP. You don't have enough memory to worry about Vista64 yet, and XP is perfectly fine until Windows 7 ships.