i would say it's worth it. The processor will bottleneck the graphics card pretty good but you will still see a huge difference. Plus the 8800gts will still be a sweet card when penryn comes out. I just ordered one. It should be here on Friday
The OCZ PSU supplies a minimum of close to 44A on the 12V rails while the Corsair supplies a minimum of around 36A. Plus, the OCZ is 25 bucks cheaper.
Video Card: The HD2900XT is going to be out in around 3 weeks. I would wait before buying a new video card.
COMMENT: If you end up upgrading to Penryn or Agena, you are going to have to switch over to DDR2 memory. You're DDR will not work.
Either wait for Agena or Penryn before upgrading or pick up an E6600 for around $234 which is one hell of a deal. You can get an aftermarket heatsink and oc this bad boy like crazy. Or you can get the E6420 and save around 40 bucks.
If you are not into OC'ing and want to go AMD, then the Athlon 64 X2 6000+ is a comparable to the E6600.
But if you want the best price/performance then the E6600 is the way to go.
PSU: I chose Corsair because i know for a fact it fits in a P182B (BIG case needs LONG cables). I am not sure about the OCZ, but if it does then sure why not.
Video Card: I have used both Nvidia and ATI and i like Nvidia better, so i am staying away from ATI regardless of whats coming out.
When and if i upgrade to Penryn or Agena I will change my mobo, CPU, and RAM.
The reason i am buying RAM now is because it is only $75 and it doubles my RAM. As far as AMD and Intel, i have always used Intel and never AMD until now, and i am generally happy except for some compatibility issues. I am not into overclocking at all (at least not yet).
If you want to go Nvidia then at least wait until ATI releases the HD2900XT or HD2900XTX or both at the same time. There's a lot of confusion as to what exactly will be available next month.
This will hopefully cause the 8800 series to come down in price.
My previous 2 video cards were Nvidia (4400 MX & 6600GT). They were good at the time I used them. My current video card is the ATI X1950XT which hit my sweet spot of just under $200. I'll tell you that this card rocks. I have a Viewsonic 22" Widescreen and I play NWN2 at max settings. The opening scene is just spectacular.
If you are buying the 8800GTS 320MB for DX10, I think you would be better off spending a lot less money for a 7950GT for around $190 to beef up your current system.
When you are ready to go Agena or Penryn, I would then get the best DX10 card you can afford. You can always sell your old components to recoup some cost of your new computer.
The Penryn will use the LGA775 socket. That means that you can use current motherboards with the Penryn. Also, 1GB of RAM is just not enough if you are doing any kind of (newish) gaming. I suggest Buffalo FireStix or CellShock memory. I would also suggest the Corsair 620W PSU. Very good quality piece of hardware. I would also see if I could snag a cheap 5200+ and use that for a while.
I didn't count. I am broke though. Actually I did count but I am not going to post it. If you will notice I just updated my mobo. I am going to get a serious liquid cooling setup this summer. And I build all my systems. Never bought a pre-built PC in my life.
Intel Core 2 Extreme X6800
Kingston HyperX 2GB PC9200
DFI UT LAN Party 680i Motherboard
EVGA 8800GTX 768MB (x2)
Western Digital Raptor X (x4)
Seagate Barracuda 16MB 250GB (x2)
Creative Sound Blaster X-Fi Platinum
Lite-On DVD-R/RW SATA Drive
Thermaltake Power Express 250W PSU
PC Power & Cooling 750W Quad PSU
CoolerMaster Stacker 832
CoolIT Systems FreeZone