Musical Fidelity A-Series: which is the best of this group?


Hi folks,

Regarding Musical Fidelity’s A-Series integrated amplifiers, which is the best of the list below for being laid-back, smooth, warm and/or “tubelike” as I have seen written on more than one occasion? Of those, which has the best imaging and soundstage as well? 
I’m running Vandy 2CE Signature speakers with an Arcam irDac and Cambridge CXC transport. I’m coming off Krell and Naim gear which was better mated to my old Vandy 2C’s, which were more laid-back and slightly bloomy in the bass. The 2CE’s I have now are much better balanced and detailed in the bass, as well as having more presence in the mids and highs. They don’t mate well with the full, forward sound of Krell or Naim. Does anyone have any experience with all the models below that can give a comparison? 
Musical Fidelity Integrated Amps I am considering: 
A300
A3
A3.2
A3.5
A5
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