McIntoish C8 or PrimaLuna EVO 300

Both of the McIntoish C8 and PrimaLuna EVO 300 preamps seem to check the boxes in terms of inputs, outputs and features, and I can lift them.  Does anyone have experience of either or both of these preamps?

I think my system is in need of a bit of warmth, I have noticed recently that the very highest violin notes are a bit aggressive - in the recent past I've been listening to mainly choral works and had not noticed this.

I was playing the Hilary Hahn sonatas and partitas, (I have the disks and digital) and noticed the problem.  I dug up my 40 year old (!) C-J PV6 and the sound was sweet to the top, but that pre-amp  lost the air and space of the choral recordings; everything was warm and cuddly but the sense of the recording space was lost.

My interconnects are Cardas Clear Reflection and I have the issue on both analog and digital - and with SS or tubed Power amps.

My current preamp is the Benchmark LA4 which is, perhaps, a bit on the analytical side of neutral.

Changing from my Rockport Atria II speakers is NOT an option. 

So, I am looking for warmth but not losing the sense of the space, Am I asking too much in the $5k price bracket?