I'm owning AE900 for just DVD viewing and setup in an dedicated room. Not using for games as LCD is not recommand for games and PC application due to burn in issue.
base on your requirement and budget, I would suggest to DLP over LCD projector. however with that price range and to get 720p DLP PJ, the only option is to go for 2nd hand. check this out, my friend is selling his Benq PJ is a good price:
http://www.xtremeplace.com/yabbse/index.php?topic=40926.0anyway.there is lots of consideration before you put ur hard cash into the PJ. Thing like throw distance, screen size, screen type, how u mount ur PJ...etc
But once you setup..u will never go back.
for more infor on PJ, u can ask the experts here:
http://www.xtremeplace.com/yabbse/index.php?board=12.0btw, as for the bulb life..by the time is EOL, u will be looking at the next model of PJ with improve sepc. the price of bulb is about S$500 range, if u want, u can get OEM bulb.
if u want, u can come over to my place for short reviews how I setup my PJ and from there see whether u want to go for it. PM me and let me noe.