I would go with what Mrtennis said. If you want more warmth, go with valve amplification.
I do not deny that the above posters who are urging you to fix your room have a point, but fixing the room will not change the harmonic structure of your amp-speaker combo. Fixing the room (in my experience) does not give a sterile sounding system warmth. Rather, fixing the room improves imaging, gives you a more consistent frequency response (provided you did it right!), and gets rid of ringing. If you want warmth, which I take to mean a predominance of even order harmonics, you either get an amp or speaker that does this.
I do not deny that the above posters who are urging you to fix your room have a point, but fixing the room will not change the harmonic structure of your amp-speaker combo. Fixing the room (in my experience) does not give a sterile sounding system warmth. Rather, fixing the room improves imaging, gives you a more consistent frequency response (provided you did it right!), and gets rid of ringing. If you want warmth, which I take to mean a predominance of even order harmonics, you either get an amp or speaker that does this.