Well, I was a tube snob also, and I decided to sell my precious tube amp. I must say that I am not a professionnal, so that is why I do not NEED a tube amp. But there's so many variables in sound, and 2000$ for an amp is just too much money for only ONE of those variables. Still, modeling amps are getting pretty impressive for recording guitars that are going to sit in a mix. But when playing alone or jamming, there is really nothing like the infinite complexity of tube amp sounds.
By the way, what kind of acoustic treatment do you have in your studio? If you don't have any, that may be responsible of a lot of trouble.
Also consider buying the radio shack spl meter. You can then measure the weaknesses of your room.