I can personally recommend McStill's stills (check in the commercial section of the forum). Bought a very nice pot still kit off him last year. I've also only heard good things about Emtyglass' work, also in the commercial section.
As a quick comparison, I first bought a pure distilling boiler ($300) and pure distilling pot still (~$400) from a home brew shop. It works fine for a small unit, but way too pricey.
Edit: clarified where I got my first unit