Texas,
Now that I have a single-chip DLP, I agree with Belmore's suggestion that rainbow reduction is a major goal when shopping for DLP.
In fact, if I was shopping for a DLP, I would put 'Rainbow Reduction' right at the top of the list of criteria, along with contrast and brightness factors.
If you can get a double-speed color wheel, 6 segment wheel, no white section, "Archimedes" wheel, etc. do it. I find the rainbow effect terribly annoying.
Even better, with your budget, you should seriously consider a 3-chip DLP or 3-panel D-ILA and eliminate the spinning wheels completely.
Having said all that, I haven't lived with a DWIN, so I can't speak to the rainbow of that particular unit.