Thus far I really really like tube preamps with the Stratos Stereo Extreme (soon to be mono extremes)
I currently have a deHavilland Ultraverve which I just love - wonderful sound, looks, construction, the whole magilla. Killed the Philly, but should for this much more.
Prior to the I had a Philly Audio Blues 7b which was also very very good, especially given the really low price.
Tried an IRD Purist, didn't like it at all. Also tried a Juicy Music Peach. Not bad at all, but didn't do that much more than my Philly did for a LOT more money.
Had a Sonic Frontiers SFL-1 which was pretty good. Also had a bottlehead foreplay which also wasn't bad, except for the construction, but why mess with that when you can find a Philly!
Tubes are an awesome match for the Odyssey amps.