Used, I've always thought highly of the Audible Illusions Modulus 2D.
You can usually get a pretty clean one for about 600.
Kit, the Hagerman or Bottlehead products are pretty cool and easy
to build. Both Jim Hagerman and Doc B are great guys to deal with.
New, I'd probably vote for the Modwright 9.0 SWL. Those are even
starting to show up on the used mkt at a pretty good price too...