both are great sets, however the 1080p model doesnt support a 1080p source, it relys on the internal scalers inside the TV to take a 720p/1080i signal to scale it to 1080P
However,
In about a month or so toshibas releasing the "196" models, those TV sets will support a 1080p signal through HDMI, and for a few bucks less. Mitsubishi has just released their 57" 731 sets, those also support 1080p.
Also next month Sony's new 1080p SXRD (A2000) sets will be arriving, IMHO Wait a month to see the new and improved, and most likely cheaper sets.