Hi there!
The only DA equipment I have is my 6" pneumatic DA sander, which while you can fit it with a buffing pad, I don't recommend it. I've considered getting a small DA electric polisher for applying polish and wax, but it's almost just as easy on a Solstice to do it by hand. The buffer does help on my S-10, though.
Dad's Black&Decker rotary buffer (circa 1969) was great -- reasonably heavy, good control, lasted until the late '90s when we couldn't get repair parts anymore. We replaced it with a $150 Milwaukee, which works great but is so heavy that it's tiresome to use. Cheapy consumer rotary buffers like new B&D stuff didn't do the job.
We've settled on two low-cost rotary buffers, plus the Milwaukee (though it almost never gets used anymore). I found a Wen for $42 right after we bought the Milwaukee, and it's been a good buffer. It has some weight to it but not too bad, and good control. It's noisy but it's lived for almost 10 years now.
The other is a Chicago Electric buffer #92623. A friend bought one to quickly fill a need, and we liked it enough that we bought a few as presents. I've got one right now and it does a reasonable job.
For pads, I usually end up with 3M pads, though I've had good success with Meguiar's pads, too.