16-17 ft should be good for most projectors. The 'throw' and projection width is adjustable and is given for most units if you can find the specs. You should be less concerned with lumen output (most are in the 1000-1200 lumen ANSI range) and more with native resolution.
It won't be long before 1080p is the norm. If I was shopping for a projector right now, that would be my primary goal. 1080 progressive on a 100-130 inch screen will literally knock you socks off.
A good reference and resource is www.hometheaterspot.com I have been a member there for 6 years. You can find a lot of good info and they have a projector forum.
I hope that helps you out. Unless you need additional info, please click ACCEPT to close our question/answer session. Bonuses are great and feedback would be appreciated too. I'll leave some for you. Thanks
Edited by Steve555 on February 12 2006 at 6:59 PM
Thanks very much and good luck.