I think you don't have that much gear to think about downsizing...
If I was you, I don't think I'd sell anything... unless the objective was to buy something else.
If you want something new, that might be relevant to give you a better answer on what you could get rid off...
One question... the DSI Mopho and Waldorf Blofeld are keyboard or desktop versions?
If your only keyboard is the MicroKorg, I don't think you should sell that one...
But since you have another good VA (excluding the Minimax since that one aims to emulate a MiniMoog), I think you should sell the MicroKorg and keep the Blofeld.
Either way, if you want a really minimal setup, my advice would be, sell them all and get a Nord Modular G2
I would sell any of my synths. I do mostly ITB stuff, the gear is an ever-rotating array of pieces I use just to get inspired. Sometimes it gets recorded, but at the end of the day I know I could duplicate any of it in software. (but then I don't exactly have any Jupiters or Moogs or anything. Nor am I a super picky audiophile either. Lofi is good!)
The only one I'd probably not part with is my Teenage Engineering OP-1. That thing is just too brilliant at getting me in the mood to write.
EDIT: Sorry, Misunderstood the question :P
Out of your synths, I'd probably feel good ditching any one of them except maybe the Blofeld. The Blofeld is a unique sounding synth and not worth enough money to warrant it's dismissal. The Mopho to me is just too difficult to program. The Microkorg & Minimax to me are just as easily doable with software.
All of them far easier to replace than Minimax if you come to a point when you regret selling.
Ha! exactly....The Minimax is a killer, both as a mono and a poly,,, and you need the Blofeld in that equation. the other two can be replaced easily. The Minimax isn't just rare...it's built beautifully (quality German engineering), and it sounds amazing....It actually takes the Mini to another level in some aspects.