Advice on a preamp


I am looking to replace my preamp as part of my next upgrade(itis). I am currently using an Opera Consonance Reference50MkII tube pre into a Sanders Magtech Amp to drive Monitor Audio PL300 speakers (3 way, 4 ohm). Does anyone here have any good experiences with a particular preamp with the Magtech? I listen mainly to Classical, Jazz, Blues & Rock. Cheers
128x128shamus2211
It's a bit above your budget, but if you can stretch a little, it might be interesting to try a Herron VTSP-3A in that system.  I haven't heard anything better. 
Used Aesthetix Calypso Signature, if you can find one.  I started with the Calypso, mistakenly strayed... found a used Calypso Signature about 3 years ago and have no intentions of trying anything different.
Any one knows how much does it cost to upgrade from Calypso to Calypso Signature.  From what I read, Aesthetix provided such a service.
No one suggested a McIntosh or an Audio Research preamp. Is that because of the price or incompatibility? Just curious.
@shamus2211
Your Sanders Magtech Amp has 100kohm input impedance, a perfect candidate for a passive preamp.
You could try the Schiit Sys for only $49 and it’s returnable, it also has 2 inputs.
This should give you more transparency/dynamics and a tighter/controlled bass than what you have now.
http://schiit.com/products/sys

Cheers George