I concur with millwood.
I've been a PSB owner since early 1998, running 800i's, 200ci, and a variety of Alpha and Alpha Mites.
I run my dedicated basement theater with the PSB's and a Pioneer VSX-26TX, which is a model year (or two) before the 45TX.
I've held several demos for local AV-philes, and they have consistently found the sound from the 26TX/PSB 800i/200ci front combo outstanding.
The Alphas perform very well with the 26TX, also. The opinion seems to be that the Alphas are somewhat brighter than the 800i's (not suprising given the much smaller package, one less mid/bass driver, and different crossover), but perform admirably.
Be sure to use a subwoofer in series with the Alphas, using the sub's high-pass crossover to pass everything above your sub's upper range, and you'll be good to go.