I used an Ayre V-3 (fully upgraded) on GenIII's for a year before upgading to a V-5x and it did an excellent job. There are several for sale here (not mine).
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The Audible Illusions is very musical and has plenty of texture. But teaming it with a tube amp may not give you the slam you're looking for.
For something that doesn't have much sound of it's own try one of these Digital amps. Spectron, Bel Canto.
You'll get the slam & dynamics that the VR-4jr can produce without the transister artifacts throw in.
If you haven't purchased the AI preamp, check out the BAT preamps. Better bass control and palpability without loosing the musicality. The BAT/VR combination is spooky real.