Any suggestion of preamp for Pass' pwr amp X.5

(Other than XP-30 and Xs preamp.)

Budget: US$17K (brand new price)

requirements:
- solid state,
- fully balanced,
- two main output, (adjustable output gain is more preferrable)
- separated power supply,
- airy, dynamic, musical, big soundstage, transparent, emotive vocal.

Please advice me.

Thank you so much!