butzla, I just recently picked up a TS55, RO150, and CT22, and have been very pleased with all of them. The RO150 is definitely a large sander, and I was initially rather leery of how maneuverable it would be. I made MANY trips to a local Festool dealer who has demo models of both the RO125 and RO150 and just played around with them. The RO150 really needs two hands when in Rotex mode, but you can easily sand with one hand when in random orbit. The RO125 is smaller, and may fit your hand a little better, depending on how big your hands are. Also, the RO125 has a tighter sanding stroke, so you can probably get a slightly nicer finish, at the cost of not as aggressive.
I have been VERY pleased with my CT22, my first suggestion would be to buy the Hose Garage, I use mine to store both my hose AND power cord, rather than trying to wrap it around the little cleats on the rear of the unit. As for the RO150, it comes with a very nice sampler of sanding sheets. I use mine for scribing quite often, so my next purchases will likely be a 5 pack of the 24 grit Saphir sheets, and a Hard sanding pad. As suggested earlier, there are many threads dealing with this issue, very helpful. I hope this helps!