Artur, I have the Da-lite, 60x80, high power, model B screen that, I use for the LT 150. I purchased it after reading the pros and cons on this forum, about which screen was prefered for use with this pj. There are some who prefer the grayhawk, but its cost was too prohibitive, especially since I will eventually change pj's, and the correct screen to match with each pj may differ. The cost of the Da-Lite was something that, I could easily replace.
The PQ on this screen is very crisp and bright, and the $270 cost for a HT screen is really relatively minor.
Your Mileage May Vary with what your eyes percieve, however, many on this forum use this screen over any other with the 150.
Ultimately, each screen has its good points, and depending on *your* wants, whether it be contrast, better blacks, or a brighter picture, etc., you'd have to actually see for yourself, but for $270, you really can't go wrong here.
The people I've had over to view movies, can't believe the PQ on this screen.
I believe that this screen will give you a good benchmark to make your comparison with RPTV'S.
Ciao, Vittorio