Rear projection DLP/LCD uses lamps just like front projection and those lamps cost about the same. Several hundred bucks!
If you are concerned about lamp life, most online projector etailers (of reputation) have lamp warranties for 3 years for about 100 bucks. So, you can use your front projector as much as you want and they will replace your lamp if/when it blows (I think up to 2 or 3 times). Well worth it for heavy projector users.
Which projector is best is a matter of opinion and LCD projectors look absolutely phenomenal with ratings as good as most DLP models these days, but there are some excellent, very inexpensive DLP models available as well. Of course, 1080p front projection will set you back a bit more money and LCD is the cost leader by a long shot still.