Well, you'll definitely want to go with an ATI card. If you're getting the card to play games, get the 4870, or 4850 if the 4870 is too much, they just perform better.
If you want the card for an HTPC build, you'll want the 3850 or 3870 as they'll play movies at 1080p just as well as any other AND ATI's 3800 series and above cards pass sound straight through HDMI to your TV. ATI's cards have onboard sound decoders. The 3800 series cards have onboard 5.1 audio decoding and the 4800 series cards have onboard 7.1 audio decoding. And they all pass through HDMI when you use the included DVI-HDMI adapter.
Even if you have surround sound computer speakers, if you have an HDMI receiver, you can use the video card to pass sound to your receiver and then to your speakers and eliminate the need for a discrete sound card or even using your motherboard's onboard audio.
EDIT: I think I may have gave you more than you were asking. I was also assuming your JVC HDTV has HDMI. From a pure gaming perspective, I'd get a single 4870 and crossfire that later with another when prices drop down a little or a good rebate comes out. If you don't want to wait, a crossfire 4850 would definitely give you some graphic horsepower. Also, depending on how long you're going to wait, the 4850x2 and 4870x2 are coming out in about a month. And some people will argue with me that it doesn't matter, but I'd choose a board with PCI-Express 16x 2.0 slots and not just PCI-Express 16x 1.1 slots. Which brings up another point. The new 790FX boards with the newer SB750 SouthBridge are coming out at the end of this month the last I heard. It may be worth waiting on those too. lol i hope this was somewhat helpful...
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