Advice on pre-amps needed

I would recommend to look at a SST Ambrosia.  The only pre on your list that I've hear is the Ayre K-1x..... so,  I can't comment too deeply on how it would compare with all that you have listed,  but I can tell you that for me,  the SST has a slight tube flavor and it is solid state, yet is allows a very clear picture of what each amplifier and cables sound like more than any other pre that I have used.... It has an excellent phono and headphone section both,  single ended and balanced and remote. Plus.... tone controls. 

May not suit you, but looking is free. 

frankpiet

Or Frank, if you want to go full balance all the way with what I suggested above, your Audio Aero has balanced outputs as well controlled by it's volume control, and the Goldpoint comes in balanced also. Myself I'd stick with the rca version.   
http://www.goldpt.com/sw2x.html

Cheers George

2005 was mostly sober....ha