Some of them best tomatoes I've ever had came (in winter!) from Thanet Earth, a massive indoor grow op in Kent, England. They grow all year under massive grow lights.

I think a lot of the really good flavours in tomatoes are a function of sunlight exposure.

I've yet to find any. I agree with tdrdt that they all taste watery, so much so that I'd aim to avoid Dutch tomatoes whilst living there.