I think that Pass Amps are the only amps that I have ever heard that seem to be a match for every speaker. They are just the abolute last word in amplification in my opinion.
With the excellent Vandy 3a, that will just sound great, good choices.
If you ever move to the Quatro, 5a, or dare I say it, the 7 in the Vandy line, you won't need to change amps.