tube preamp with satisfying low end?

Hi:

Just spend the afternoon auditioning a couple of pre-amps. The VTL TL2.5 and the Adcom GFP-750 on Magnepan 1.6 speakers and a Bryston SB-3T Amp. Overall impression was that I love the VTL warmth and bloom on the mid range and high end. However, felt that it was definately lacking in the lower midrange and bass. Adcom had much better overall dynamic range and clarity, however it had that digital edge to it that can be a bit fatiquing. Am looking for a preamp that has the "glow" of the VTL in the mid and upper ranges but has better low end. Any suggestions? My budget is no more than $2000 - new or used.