Opportunity to buy the best Preamp... but which?

On the tube front... AR Ref3 vs. CJ ART3 vs. VL TL-7.5 vs. Wavac PR-T1?

Or on the SS front... Burmester 808Mk5 vs Dartzeel NHB-18NS vs Krell Evolution2 vs MBL 6010D vs Halcro DM10?

My preference would be a neutral tube based model.

Any opinions?

Andrew