Bbeery, I use both reciprocating and rotary carving because of tendinitis in the joints below my thumbs. Both methods are a hugh help.
Paul is right, the reciprocating makes smooth cuts. The rotary, using the heavy duty burrs, makes fuzzy ones. Which is okay, because I handcarve all that away.
With rotary you are going to need a dust mask, eye protection (needed for the reciprocating too) and a dust collector.
Do you have a Dremel or similar tool? There are both rotary and reciprocating FlexShaft attachments to use with it. It may be a less expensive way to go, if you're going to be doing smaller projects.
I have the MasterCarver system, it has both reciprocating and rotary, I really like it, it's a 'heavy duty system'.
I totally agree with Paul about the AutoMach. Awesome little reciprocating carver! I also have the Proxxon, it's not as quiet and heats up more quickly, but cuts just as well and is a great little tool for smaller projects.
Hope this helps some, good luck!

Deborah