Arturia Minimoog V Original
And I really need to do the Maschine 1.8 update and play around with Massive again. I didn't like it enough to pay for it, but it might be fun free.
I'm very close to going in to play with a Minibrute, though. But, if I do, there's a good chance I'll be hooked on hardware and either buy one or go start trying to find a Nord.
Edit: Totally forgot the reasons. I chose them because they were affordable (or free) and supposed to work like hardware synths that I want………and the minimoog was free and kind of iconic.