I own TNG, DS9, Voyager, and Enterprise complete series on DVD. I've watched the first three, and I'm halfway through season 1 of Enterprise. When I'm done with Enterprise I'll try to find good deals on ToS and the movies I don't own.
and to echo what El Barto said, In The Pale Moonlight was one of the best episodes of any series.
...and Sub Rosa was about as low as any of the series went. I think you need to make a drinking game out of it to make it tolerable.