Replacement for DeHavilland Ultraverve

I have a DeHavilland Ultraverve. It sounds great, no complaints.  I need a little more functionality-mono and phase buttons are what I'm after. I see a Herron 2A preamp on Audiogon. Any other suggestions would be appreciated. The rest of the system: Bryston 4B SST, Bryston 4B (2nd zone), Vandersteen 3A Sig, Luxman E1 phono, Amadeus with Dyna 20 LOMC, Marantz SA14S1 CD/SACD. Balanced connections are not a priority for my system.