Sorry, I didn't quite catch what the problems are. I'm still not sure what your situation is. Do you already have the 27" TV/Monitor? If so, what brand/model? Is it widescreen? What is the native resolution?
What do you plan on using it for? Gaming, watching DVDs, internet surfing, or word processing?
It's very likely that any of the newer graphics cards will do just fine... any NVIDIA 6800 might be fine for you.
If gaming is your thing, then you shouldn't wory about which Video Card to get, because the latency of the LCD screen won't keep up with the frames per second provided by even a mid range video card.
Games look great in the widescreen format, but LCD screens always look blotchy when there's a lot of motion on the screen.