9800GX2 is the recently launched high end card from Nvidia. It is basicly 2x8800GTS stacked together. And you can SLi this card as well meaning the power of 4x8800GTS. And this card can be bought not just from eVGA but a lot of brands make them now.

As for LCD TV. 40" might just be too big to dual-box on. But I like the Projector approach as you can have your alts in the background wall while your main is on a LCD right infront of you.

Downside to Projector is the room has to be dark which sometimes makes life a little bit difficult to use your keyboard/mouse even if you had back lit keyboard.

Just some thoughts