Optoma HD70 720p DLP Home Theater Projector (2008 Model)
Affordable, quality projector.
Just received 2 days ago to replace my 480p Infocus 4805 and am very happy with the step up in resolution.  Much quieter than my 4805, better picture, and HDMI input are the biggest advantages so far.  Seems to be very solid, light but not flimsy.  Zoom and Focus dials have a little tension which makes it easier to fine tune.  Great remote and easy setup.  IMO the best 720p projector you will find on a budget.