The 270 is a beast if you need power for a full-sized room -- including pre-outs so you can go to dedicated amps on any and all channels you like. Might be a bit overkill if you're in a small space, though... Denon 591 has the same Audyssey room correction but with less power, 5.1 instead of 7.2, no pre-outs (except for height/width/rear addons), and no built-in networking. Wouldn't really consider anything in between, unless you're interested in looking at last year's pre-3D models.
Pioneer 1120 is the first non-Elite worth looking at in years, but its best feature (excellent upscaling) is totally wasted on your small 720p set. Not worth a price premium.