I use a 17" Victor rotary and it is great. I think I paid about £120 or so for it a few years ago.
I have a few pads to choose from, Texatherm cotton, Solutions microfibre and one grey XR Super Scrub Pad which is great when needed. Currently I favour the Texatherm ones (£150 for 10 which is a good price).
I tend to favour Fusion Clean from solutions but that is because it was the first thing I tried when getting in to bonneting and it worked so well. I do have Prochem Pureclean and Bonnet and Buff too and both are also reported as good, although I am yet to try them out.
I would honestly recommend keeping initial costs down by buying a used standard speed 17" Victor. Shop around and u will drop on a good one.