Upgrading to Tube; Amp or Preamp


I am currently looking to upgrade my existing system a piece at a time. I currently have a set of Vandersteen 2ce Sigs, VPI mkIII w/RB250 Origin Mod w/Dynavector cartidge, Adcom 565 Preamp, Adcom 555 mkII w/Musical Concept mod, and a Rega Planet CD. I have a rather small listening room, 15x18 w/vaulted ceilings and want to migrate to tube gear. I have heard the Rogue 120 amps and 99 preamp on the Vandersteens and thought they sounded marvelous.

I am into analogue mostly classical, jazz, and some rock. My budget is in the $2000 dollar range and since I want to get as big a bang for the big would it be best to replace the Preamp or Amp. The Adcom gear is a little too bright and the soundstage and imaging are not near (imagine that)what I heard with the Rogue combo. I like the Vandersteens alot but have heard that they get a little too laid back with tube gear. My aim is to put about two to three thousand in my system a year until my wife stops me.

Look forward to the suggestions, oh yeah getting rid of my wife is not an option (ha, ha).
rav1952
Mag 3.6. Got Paul Speltzs' Zeros as back up for my MA-1 MKII just in case :).
In revisiting this, for $500 more than your budget you can do exponentially better than my original recommedation of adding a good pre-amp to your current power amp...

Check out VTL's 85 watt per side integrated amp (think it's called the IA 85). It's $2500 and will provide a major upgrade over both your pre and power amps. A conservative 85 watts -- more than enough to power your Vandy's. Saw this at a Vandersteen dealer who does not generally like VTL gear, (at least compared to ARC), but likes this a lot. Supposed to be great synergy with the Vandy's. And I think it has a headphone jack to boot. If you are in SoCal, email me offline for dealer info.