Wow, I haven't seen so much ignorance in a single post in quite a while. 
1:GT<GTS<GTX in the Nvidia naming scheme in general. The GTX moniker has been used for their top end model for the last two generations.
2: The main selling point of the 8800 cards has nothing to do with DX10. It's their superior DX9 performance in current games. The 8600s are pretty worthless right now, but that certainly doesn't apply to the entire 8 series.
3: The video acceleration on any of these cards is useless for most people, since it only works with their own software and that costs money. They apparently do this to cover royalty fees on the video formats. Besides, modern CPUs have no problem running HD movies anyway, unless you're doing other things at the same time.
Wow sorry, i did make a mistake in here, i meant gs and not gts. I was just going over a fued i had with nvidia trying to by a geforce 6. I was like 6600 or 6800, after that which card isn't crippled, and what the hell is the difference of the gs, xt, gts, etc. The geforce 6 series was sort of confusing in that and what made me decide on the 7 series. Lol, yeah my post was a little ignorant more out of past anger than anything. I did some extra research, xt is fine cards, and so is gts. And yes cp5670 i do know about the gt as well, otherwise i wouldn't have bought a 7600gt. Anyway pretty much stay away from anything GS in the nvidia arsenal.
Modern processors have no problem running hd movies anyway? I beg to differ to a certain extent, i watched hellboy ripped from a blu-ray disc on my brothers laptop which is an intel core 2 duo 2gb ram and an nvidia quadro. It did ok in mplayer except for the parts of hellboy where there was really fast action or lots of fire when the computer started skipping frames taking 100% of the cpu's at full power to play the movie with the good old video card helping along. The movie for the most part was watchable to a good extent, but cpu intensive is a **** yes on that one. The hint of advice for hd movies on a computer is that you don't do it on a single core machine. One reason it's cpu intensive is because of the compression methods used such as h264. If you have at least a dual core and have video acceleration at your fingertips, you might as well use it, video acceleration of hd movies on a computer removed as much as 40% of the workload away from the multiple cores(various benchmarks i remember i think from hardocp.com). Anyway, multiple cores should have no trouble, but they still do unless you have a pretty good system that isn't lacking. Hd movies take tons of processing power and resources. I'd say the modern processors no trouble in hd movies is true only to a certain extent (the lacking resources extent) and even when everything is perfect for resources i'd still say you'd have a few moments in hd movies where you had some obvious dropped frames. Anyway, the more cores, makes the chance of having no dropped frames and slowdowns much greater

****.
I'd just buy me a good high-end card now, and hold out a couple of series. Considering most games don't fill out current card's abilities anyway.
Sounds like a great idea actually. You won't need to replace that card for a while. In fact i'd still be using my 9800pro 256mb today if it hadn't suffered memory overheating problems that i had no time to fix (it's what prompted me to get a 7600gt, and it's so much better than my old 9800pro, but like i said, i got the 7600gt out of necessity for another video card period)