SB-SIX
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Get the OT 
I’ve had a machinedrum for a couple of years, but found it a little limited. It has a certain sound you can’t escape of unless you use samples. I ended up using only samples on the MDUW. This is a big hassle on the MD and the OT is much more suitable for that. Plus it does much more!
I also have the tempest and pulse 2. The tempest is really fun for synth sounds with its 4 oscs per voice. The single cycle waveforms add timbres you can’t get out of other analogs, the pads are fun to play. Downside is the tempest needs FX, so you’ll find yourself buying a mixer and some FX units to make it really shine.
I also have the pulse 2. It’s a very versatile unit. Not completely finished though, there are some bugs in it (especially in the envelopes). The sub phatty has more character and more knobs so the fun factor is a little higher, but it’s less portable.