Ray Glasser's Beta Info Guide is located at
http://www.betainfoguide.com - but I just went there and the account is suspended. Bummer.
http://www.palsite.com/home.html is another resource, lots of links, but it's skewed toward PAL format.
There are 3 Beta "dream machines. The SL-HF900 is the one I own. The last one, the HF2000, is the one I want - one of the last commerical Betas made, released in the 1990s. Yes, Beta lasted that long, and the pro decks are still in use at television stations and in engineering (they're used for 3D modelling).