B&K ST202 combination w/modwright pre-amp?

I have a B&K ST202 SS amp and looking for suitable pre-amp to provide better soundstage, tubey openess my B&K 10PRO MC cannot provide. Budget <1,000

recommendations needed
VTL 2.5-owned one, liked it a lot. Ran it w/a B&K EX4420. Saw one the 'gon but IMO it's overpriced.

AES made by Cary-listened to one for many hrs. in somebody's system. Very nice.

BAT VK-3i is a very good piece too. They don't show up very often. Owned one of these w/BAT amp. Great combo & should do well w/your B&K.