Dear Canuck friends

!
It's your old noob from Nicaragua back again in search of your collective wisdom. So far my RAM and PSU are still working and I have not had to deal with any budget draining, PC-related emergencies so far.
My question now is about GFX cards and LCD TVs. I am currently using my 32" LD330 LG LCD TV as a computer monitor and like it very much. I am also using a Radeon HD 6870 for my current gaming needs but I am always on the lookout for potential upgrades( when my budget allows it

). The thing is, this time I want to be wiser when it comes to potential future upgrades. My TV's native resolution is 1360x768 and I plan on playing at this resolution for the foreseeable future. What GFX cards would you recommend for playing PC games, with mostly maxed settings, at that resolution without having to spend a ton of money on the latest GFX monster cards that have just come out? Any specific Nvidia or AMD cards that come to mind?
Suggestions would be most welcome