Restricted viewing angles, hot spotting, white field non-uniformity, color shift, etc. These are all characteristics of higher gain, Fresnel/lenticular, rear projection type screen composition. As the gain is increased, these consequences also increase in severity. Less gain is required if lumen...
The LED lamped DLPs have various problems due to the extra gain required in the screen design to compensate for lower light output from the lamp. There's pros and cons like any TV design. I tend to prefer the traditional lamp versions for overall image quality.
Just be clear on your priorities. The current batch of DLP RPTVs are not very deep. Subtract the depth of a wall mounted LCD and mount from a 12" deep RPTV and you'll likely only have about 9" of difference. If you go with an LCD, I wouldn't recommend anything but one with LED back lighting for...
If you are really serious about achieving the best viewing experience, I don't recommend hanging any TV on a wall. Front projection is different story. I also don't recommend LCD over plasma or DLP for the best picture quality. LCD is good for solving certain sets of problems but not for...