You should probably spend some more time with your avatar before you sell it (if that's your intention). It sounds like your mono/poly has grown on you and you have some regrets about putting it on ebay.
I would get a sequencer to run the avatar and then make a determination. I find that every synth has a vastly different character when played with keys and when sequenced. For cv sequencers you should check out the future retro mobius. It's compatible with V/Oct and Hz/V synths and it's super straight-forward to program. Plus, you can bypass the sequencer and simply use it as a midi to cv converter.
It also spits out din sync so you'll be able to slave your 808 in the future.
Yeah, I do sound pretty wishy washy. Im kinda stupid. But I have a minimoog already and I have an arp omni. The avatar doesnt give me too much extra (not that the omni is that comparable. Its too similar to my minimoog to justify keeping it. However, I do love the dirty flat sound of the avatar.
RIght now I drive a $750 truck from 1993. I dont think i can justify having three $1000+ monophonic synthesizers.
In regards to the sequencer, I was using the monopoly as the sequencer for the avatar a lot. That is when I had the most fun. But still...not much there extra.