I find myself craving a hardware synth more and more. I've realised that whenever I have a moment to spare, I'm not really making music, I'm just playing around with sounds, so I figured I might as well do that without starting a computer and launching Live. But even though synths are not as out of reach as they once were, it's still a major investment. I'm drawn to something like Arturia Microbrute, as that kind of sound is very close to my heart, but I'm sure there are other synths that would give me more mileage. OP-1 and Circuit look like fun units, but I really prefer that meaty feeling of a classic synth, with knobs and faders that only have one function each, and no presets either. And this brings me back to the Microbrute, as it doesn't have too many parameters (don't want to get completely lost, either).
I ramble. Tl;dr: I want to touch knobs. And faders.
I had and loved the Microbrute but for the price the Korg Monologue has pretty much made it obsolete as a basic monosynth just to play around with IMHO, unless you really want that exact sound or want to include it into a modular setup.