Pre amp replacement?? Help

Just image the compromises when building a $1000 pre-pro.  Now take that same budget to build a pure preamp.  I'm not knocking Sony ES.  They are nice.  You will be better served with a 2 channel system.

Agreed ! If I budgeted for 2k what are my good choices?

The Sony does a a direct 2 channel bypass however 

$2k is probably overkill when looking at the rest of your system.  I'm not trying to "knock" what you have, just keeping things balanced.
You can get a heck of a lot of preamp for $1000 to $1500.  Make sure it has a phono pre built in.  Other things you need to consider are remote control and digital inputs.
Although old school, the Pioneers are legendary.  I think that if you split the budget between a pre and a power amp you might get more bang for your budget.  If you are not using the Carver for multi channel, sell it and add that to your budget.  I'm not sure on the sound of the Mirage.
FYI:  I'm not a fan of Carver, sorry but that does sway my opinion.  I would prefer 36 tube watts over 360 bridged Carver watts.

I would say look for a preamp without phono. If you get serious about using your TT, there are plenty of good lower cost phono preamps. Again just my opinion based on your budget.