Dave Smith Instruments SYNTHESIZERS

Hi all,
           I am curious to find out people's experiences with stacking the evolver.  I currently have my MEK stacked with a Novation Super Bass Station and an Alesis NanoBass.  I find the Novation's arpeggiator rocks with the evolver's sequencers and the Alesis spares me having to always add bass to the evo and SBS (It also doubles as a fake bass).
   I have also stacked it with an Access Virus B and the sound is almost too good to be true.  The only drawback is that the Virus is a bit cramped on the MEKs keyboard (especially when splitting the registers).  
   Oh, and I've gotten some crazy sounds by pairing it up with a Red Sound Dark Star, but the Dark Star gets a little buzzy and underwhelming after a while.

I am wondering if anybody has found a 'perfect compliment' (or maybe antithesis) to the MEK.  And why?