Wanting to build a HTPC around a GeForce 8800. Need advice

Zepher said:

Just get 785G based mobo, dual or triple core AMD proc, 2 or 4GB of ram and you are good to go. no need to even use that Video card or any video card.
Onboard works great.

Newegg.com - ASUS M4A785-M AM3/AM2+/AM2 AMD 785G HDMI Micro ATX AMD Motherboard
Newegg.com - AMD Athlon II X3 435 Rana 2.9GHz 3 x 512KB L2 Cache Socket AM3 95W Triple-Core Desktop Processor ADX435WFGMBOX

Here are the specs for my HTPC that I use for playback of 720P rips, 1080P BluRays, and Netflix that I built 2 years ago,
Silverstone Sugo SG02B, ASUS P5N7A-VM, E6750 2.66Ghz, 8GB, 1 TB, Lite-On BD Drive, Panny TH-42PZ80U, Win 7 Ultimate 64bit : HTPC

I really like that mobo, onboard video and S/PDIF. That means I don't need to purchase a sound card.

So do I understand this right (from the mobo item description)?

You'll also have access to the most powerful and fastest video processing around when you install a discrete ATI video card that will work in conjunction with the onboard GPU for a unique Hybrid CrossFireX configuration.

If I had an ATI video card I could drop that in and it would work in CrossFire mode with the onboard video right?

So if the above is true tell me if this makes sense to do or if it's overkill:
I have a Radeon 4870HD in my other computer. I don't play PC games much anymore (slash ever). I could put the 8800 in the PC and use the 4870 in the HDPC to take advantage of the xFire. I realize the 4870 itself would probably work just fine (in fact so would the 8800) but will I see much of an advantage by going this route or will this be a performance overkill that will never be taken advantage of?

Actually if combining ATI cards like that would enable me to play PC games on the TV I might even do that once in a while.

Again, 42" 720p Plasma tv.

I just ran across this while reading up on the recommended ASUS mobo
Newegg.com - Computer Parts, PC Components, Laptop Computers, LED LCD TV, Digital Cameras and more!

Seems like a good deal, although I have no need for the TV Tuner card and I wonder if there's a way to remove that item and still qualify for the combo discount...