1080P on 27 inch is basically the domain of computer monitors, though some of those offer HDMI in. Probably around $250. If you're planning to viewing from TV distances I'd suggest seeing if you can fit a 32 inch 1080P though, I think the combined size and resolution increase would be much nicer than resolution alone.
BTW, most current console games render at 720P or less internally then scale as necessary:
http://beyond3d.com/showthread.php?p=1113344
The PS4 may change that. COD:Ghosts and Battlefield 4 have internal resolutions of 1920X1080 and 1600x900 respectively on the PS4 - compared to 1280x720 for both on the Xbox One. I expect that trend may continue as it appears PS4 packs a more powerful graphics chip.