Tube amp / SS pre or SS amp / Tube pre?

Somone who's opinion I respect, told of an unlikely but suprisingly good system with Mark Levinson pre going into VTL mono amps.

Marakanetz and Zaikesman suggestion of putting solid state pre before tube amps usually offer more opportunties for appropriate impedance matching.

Labtec and Ohlala, brings up some good points. Many prefer to use a tube pre with a solid power amp. This is due to costs, heat dissipation and trying to make the most of the typical advantages and minimize the typical diadvantages of tubes and solid state. Everything posted so far is true, it's a big picture to view. As for running a tube CD player into a solid state amp, you usually end up with impedance challanges that limit choices of compatable ss amps. The advantage is a simpler less expensive signal path. Other disadvantages include limited selection of CD players and often limited or non-existant switching capability.