Just saying: keep the power bill in mind when comparing prices.
1080p? Depends on the video. I can watch the guild wars 2 trailers just fine without GPU acceleration, but some h.264 videos just stutter. Funny enough, my notebook GPU should support VDPAU, but the video doesn't play any better with mplayer -vo vdpau.
Still, VDPAU is a convincing argument for the 260 GTX if you're planning to watch lots of HD content. If you can get it to work, that is. Then again, with a 1680x1050 monitor, why would you want 1080p?