The TAD-150 is a very nice pre, especially for the price. Lots of detail and good low-end control. Not something always associated with tubes. It really fit well with the McCormack amp. If you're looking at pre-amps under $1500-$1800, tube or solid state, I'd give the TAD a listen.
I forgot to mention that I also have a Behringer digital EQ. Keep in mind that I'm one of those people who thought the shortest signal path was ALWAYS the best. But this thing is amazing. It basically corrects for room errors at your listening position. In my room it's like focusing a camera lens. When I bypass the eq, it's out of focus and fuzzy when I put it back in the signal path everything snaps in to focus. More detail, more space, etc. And I don't mean "oh I think I hear a little difference", I mean "holy crap! how did I think that sounded good before?". It is the single biggest improvement I've made in my system. And it only cost $265. Do a search on it and then if you're not convinced buy it from someplace with a 30-day return policy, that's what I did, but you won't return it.