so many options these days
here are some sites I recommend looking at for good reviews.
and my most recent favourite
The other place to look is kickstarter - lots of interesting 3D
printing projects, existing and past - to wet your appetite
the following is from memory - this space keeps moving...
in terms of functionality for art, filament based is good for
sculpture or larger pieces. You can get wax filament. filament costs
~$30-100/kg Prices vary from $300 DIY RepRap to typically $2-5k and
north from there for industrial machines. ($20k gets you a very
robust production machine)
For finer work (jewelry) you want SLA or DLP - lasers and UV curing
these can be expensive, $2k+ and the resin isn't cheap - $400+/kg
(there are some smaller cheaper ones, but resolution gets poorer
having said all that - start off by using a service (shapeways et
when that isn't economic any more, buy a printer. Also by that stage
they will be cheaper and better.