I am currently using an ARC LS-5 (GNSC mod) with excellent results. I would consider limiting your choices to units w true balanced output to optimize performance of the V-5XE.
The K5xe is an excellent solid state preamp at its price level. However, they're better to be had in the tube arena. The Ayre K1xe is an excellent preamp anyway you want to slice it but very expensive. If you have the money, it mates superbly. I agree with the BAT 51se recommendation also. Good match.
I don't have, but have heard Ayre amps paired very nicely with VTL tube preamps. Very musical combo. The VTL 7.5 is amazing, but very pricey; believe the new 6.5 or even the 5.5 might be a match.
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