Thanks Cat for your comments.
To clarify abit, I have never ran Vista on any system, don't own it, never wanted it.
I have seen it on other systems and it looks similiar to Win7.
The TV in the Media center seems centered around U.S. channels, most notably CBS, and whenever I try to open one of those channels it says not available in your country/region.
The channels that do come in, come in clean and crisp with no lag.
I suspect this app/technology will be the next craze for advertisers on TV.
Yes, I know there are other internet TV apps on the market, but I'm very impressed at how the new Media center seemlessly combines all your media into one place.
Multimedia is the reason I built this rig, I'm not a hard core gamer (other than Blizzard games, love em), I use my PC as a big part of my entertainment system, and I wanted it to be fast and stable. And it is, I no longer wait for apps to open, its just click click click, go go go. The Raid config helps alot with HD access times and the CPU? Well, it's no Intel chip, but it's the fastest AMD chip that was available at build time, and 1/4 of the price of the latest Intel chip.
On the video card side of things:
If you are going with ATI, I recommend staying away from crossfire, it's a fine technology, but the newer 5000 based cards are so fast they simply do not need to be doubled up (plus they draw alot of power).
Also the 5000 series cards support direct X 11, as does Win7.
I'm still waiting for the right deal on a 5000 based ATI card, as of right now, the onboard 3300HD graphics performs excellent.
I hope you do surprise your sis with Win7. She will be most thankful!