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
I agree with Travis that I am being a little optimistic about the price of a used Atma-Sphere MP-3 linestage. My brother picked one up on eBay about 3 months ago for $1,950 so it is not outside the realm of possibility. They do not come along very often but are worth serious consideration if you can find one. I am sure Travis is REALLY enjoying his music as are my brother and myself.
I plan to enjoy it even more when my speakers arrive, hopefully very, very soon. Best to you, Wellfed.
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.