What amp should be used with merlin vsm's?

Maybe merlin owners can help me with this, I am looking for an amp to go with my merlins. Should I get a belles 150a hotrod or sim w5 or a b&k st140. Are there any other amps I should look at? Which of these can bring me the best sound? I would like to get joule's vzn100 but am not financially ready, but if there is a tube amp that costs less- something under $3500 used, I would consider it.