I have done a _lot_ of research in this area. I've looked at every thing imagineable in RPTV: CRT, DLP, LCD, etc. I like DLP but I see rainbows on all of them (including the new Samsungs). I really like the Sony LCD but I don't like some of the other issues with LCD.

I've just ordered a 61" JVC HD-61Z585 D-ILA (JVC's version of LCoS). It's a three chip design and is very reasonable. I imagine you can get the 52" in your price range.