Best card for 32-42" LCD TV

Hello Readers,
I plan on building a new system this summer but it has been awhile and I'm not completely up to speed on new graphics technologies. I plan on having both a 32-42" tv and 17in monitor hooked up at all times. I don't want to spend more than 500$ on a graphics card (or cards) and was looking for some input.
I am leaning towards Radeon, but am not sure if I should spend the whole budget on one card and then upgrade later, or get 2 cards to work together. I don't mind slightly crappier performance on one card while I wait to upgrade.. well I guess I am mostly just unsure of exactly how much power I'll need to get the best picture on the larger screen without blowing my whole budget. The system will mostly be used for gaming, and the occasional blu-ray.
Thanks in advance,
Mike D

Right now I am looking at the i7 920, 6 gigs of OCZ DDR3 1600, and a WD Caviar Black pair with this board:
http://www.newegg.com/Product/Prod [...] 6813188046
I think I am between two of these: http://www.newegg.com/Product/Prod [...] 6814130370
or one of these: http://www.newegg.com/Product/Prod [...] 6814130442 at a slightly lower price.

I'm not sure if the one, higher quality card will be okay compared to the two slightly lower quality cards on the bigger screen size. I am not opposed to upgrading to two cards later, but I don't want to have to wait for good imagine quality.

I assume that your TV is a 1080P unit. That will be 1920x1080.

A GTX285 will run anything out there well at that resolution. You can attach your 17" monotor as well.

You will preserve the option to either add a second one, or sell it, and get the next greatest single card at the end of the year.

If you want, get the EVGA version, so you can trade it in for full purchase price on a GTX295 within 90 days, courtesy of their "step-up" program.
I bet you won't.