Hey speedo -
Here are the differences between the various types of RPTV displays:

LCD - DLP - LCoS (fixed pixel displays)
1. Thinner cabinet
2. Lighter weight
3. Light producing engine is via a lamp - much cheaper to replace than a set of (3) CRTs - although replacement will be more frequent.
4. Slight gain in briteness with DLP over CRT-based

CRT-based
1. Deeper cabinet (although not as much as in previous years)
2. Heavier
3. Needs convergence to look its best
4. If run in "torch-mode", CRT life will be compromised
5. By far the "biggest bang for the buck" - no contest!

From what you describe of your viewing room, it sounds like you'd be well-advised to seek some sort of window treatment to cut down on the excessive ambient light - especially if you opt for a CRT-based RPTV set.

If you do go for the latter, here are the brands I recommend:
Toshiba
Hitachi
Mitsubishi
Panasonic

In closing, let me add that direct-view CRT sets do not produce better quality images than other types of display ... they just look "better" because of the smaller screen sizes. This is a VERY popular misconception, that's helped along by the fact that many RPTVs are not properly setup and adjusted at the factories. Setting up and adjusting a direct-view (in the factory) is a much simpler process than doing so with a big RPTV.

Hope this helps you