Advice on pre-amps needed

Nagra gear is remarkably good, but given the choice I would buy the Aesthetix Janus. I have been looking at this model myself, but will probably opt forthe stand alone Rhea. Good luck in the process.

I think that depends upon whether you want tubes or not.

Tubes have that special magic, but it comes at a cost.
The cost being tube noise (tube rushing).
If you can live with it, I agree with Nrchy, that the Aeshetix is probably the way to go. It has a remote control, which might be important to you, as it is to me.
(It also has some cool phono input controls that most other preamps lack.)

If on the other hand, you relish deep, dark, backgrounds, than the Ayre K-1X is a good choice. It is very musical without being analytical, as some solid state preamps can be. (This was my choice, just so you know.) It is very good both as a preamp and the phono boards are very good as well. (It is much better than my old ARC LS-2 preamp and PH-3 phono preamp combination. I grew to hate the tube rushing noise.) I love the detail and the utterly deep, dark, black backgrounds that the phono boards provide. It also has a remote. (Note, the remote only handles volume control functions, including mute, although, it would also turn your amp on and off as well.)

My two cents worth anyway.
Good luck in your search!

thanks so far for yur input. I´m not sure if I´m really a tube lover. Currently I run my Audio Aero Capitole MK II directly into my Ayre V-5X evolution power amp - and to be honest - my Rowland Concentra II + Accuphase DP-67 combo was much better. Don´t know if the AA and the Ayre are getting better by the time (they are just two days old) but right out of the box I don´t like what I hear..