Preamp choice: VTL 2.5, CJ 18LS, Pass Labs X2.5?

Any thoughts on which preamp is a better performer? VTL TL2.5, Conrad Johnson 18LS, or Pass Labs X2.5? All now available used for under $2k, my budget.

System: Levinson 27.5, Theil 2.4s, Meridian G08 CDP, Sunfire TrueSub EQ. Cables to be determined.

Thanks, Jim