I started off on a Dewalt 849 at work (left a few marks on the hoods of Sunfires.. but it was good practice..LOL). The Dewalt 849 is an animal! I would not recommend this as a first buffer that's for sure. The Dewalt is a great machine, but it's not a forgiving machine, and the side-mounted handle is hard to work with when you are doing the side of a car (the "bailing handle" such as on Makitas and PC 7428s is MUCH nicer to work with!).
I personally bought a PC7428 for home use. It's a nice forgiving unit with a "Makita style" bailing handle, and it's actually cheaper than PC7424 in some places. It's kinda noisey and I'm used to the power of the DeWalt (which really isn't a problem, just turn up the dial- just takes getting used to over the other unit.). Ultimatley I think Makita is THE best rotary, due to it's powerful and QUIET motor, 600RPM set speed for ultra-slow polishing, and lightweight design.
I've never used a PC7424 nor a cyclo.. so I can't give any reviews on them. I just know rotaries...