DLP's are rear projection. They do look good, but maybe a little soft as compared to a plasma.
"Some" people see rainbow effects (google DLP rainbow) and don't care for them.
DLP seems to be fading away some - but it is good value for size vs $$$.
No way it will hang on the wall though.
Clay: if you can't tell the difference in TV's in a showroom, there is NO WAY you are going to see the difference between 1080i & 1080p. If 1080p is the only reason you have to move up - save your money! In fact, most sets the "upconvert" everything to 1080p have such a lousy processor, the 1080p sets look worse then the 1080i sets. Please don't fall into the spec or numbers trap! These MFG's use lots of smoke and mirrors to arrive at their numbers.