Unless your Theta Casanova does not have an analog by-pass mode, whatever you decide on, you should audition first in your home. Because the Theta may be sufficiently good in comparison to what pre you buy.
Of course, it depends on your budget. McCormack has a new pre/pro that may be pretty good.
I own Aerial 10T speakers, McCormack DNA-2 LAE amp, Sony SCD-1 cd player, and a Primare P30 pre/pro that I use for my 2-channel system. Believe it or not, the P30 was superior sonically to three popular (one rated class A by Stereophile) preamps I A/B compared in my home.
There's always better out there, but the Primare P30 has been a very nice surprise. It is a very transparent and detailed pre/pro when in 100% analog via by-pass mode.
Of course, it depends on your budget. McCormack has a new pre/pro that may be pretty good.
I own Aerial 10T speakers, McCormack DNA-2 LAE amp, Sony SCD-1 cd player, and a Primare P30 pre/pro that I use for my 2-channel system. Believe it or not, the P30 was superior sonically to three popular (one rated class A by Stereophile) preamps I A/B compared in my home.
There's always better out there, but the Primare P30 has been a very nice surprise. It is a very transparent and detailed pre/pro when in 100% analog via by-pass mode.