I know very little about 3d printers but from what I have read and seen, the quality is probably not going to be high enough for someone wanting to print a sculpture.
This might be of interest:
http://www.bitsfrombytes.com/content/bfb-3000-0
Again, I'm not sure the quality is going to be good enough but it looks like to does the best quality stuff I've seen for something that is affordable.
I'd be interested to hear the opinions of people with a bit more experience.