There are a lot of factors that need to be considered when purchasing a home theater projector. Screen Size, Throw Distance, Ambient light, and video source among others. Without knowing any of these conditions, it's difficult to say which way to go, but given pretty much default conditions, I'd probably recommend, in order:
1) Epson PowerLite Home Cinema 8350
2) Optoma HD33
3) Optoma HD20
While the Optoma HD20 is the only projector here actually under $1000 (and I'm very happy with mine), I'd really recommend going with the Epson PowerLite 8350 if possible.
You can check out reviews and specifications for each of these at projectorcentral.com.