10k 300B single ended amp, what should I choose?

Current system:
- Theta Carmen II Universal transport Transport
- Stax x1t DA converter
- Clearaudio Champion Level II Turntable
- Clearaudio Tangent Linear Tracking Tonearm
- zyx airy 2 Cartridge
- Clearaudio Balance pre-phono
- Emotive Audio Sira-LE Tube preamp
- Mastersound Reference 845 Tube amp
- SAP J2001 MkII Speaker (97db)
- Nordost, Siltech & Virtual Dynamic top of the line Interconnect
- Hydra 8 (original) PS Audio high current AC filter
- Symposium Rollerblocks Tweak
- SAP speaker stand Special for the J2001 Tweak

I'm listening to most classical music and many big orchestra.
Thanks!