Upgrading Preamp, need help, Ayre K-5xeMP or Jeff Rowland Capri S2 or VTL TL-5.5 v2?

Dear audiophiles,
Please share if you had strong experience with one of the preamps listing below.
1/ Ayre K-5xeMP to match with my Ayre cd player
2/ VTL TL-5.5 v2 to match with my VTL amp
3/ JR Capri S2 version to improve from what I'm already having, the original version.

So, I'm looking for sweet and neutral with a tad of warmth, more refine and high(er) end sounding. Basically, a better preamp that will better match with my current:
. CD player, Ayre Cx-7 original version
. Preamp, Jeff Rowland Capri original version
. Amp, VTL ST-150
(Sonus Faber Cremona speakers)

Thank you

Jeff rowland is exceptional
@nyaudio98 Yes it is indeed. Guido also highly recommends the Capri S2 version but since I have never owned the other two preamps, Ayre and VTL, it would be nice to see what others have to say.
i have heard both the Ayre and VTL, both excellent 
As far as customer service is concerned, Jeff Rowland is exceptional. I have a consonance preamp which he upgraded last year (20+ year old preamp mind you) at a very reasonable price & it sounds fantastic.