There are so many hardware instruments to choose from you can’t decide which one to buy? Start with the Korg Monologue. Even with its simple layout and architecture, it is a cracking little synth, with plenty of character, especially from he sequencer component.
We must also comment the Novation Peak. According to Andy Jones, “It is full to the brim with features and options. The sound this thing makes can be totally analogue if you want it to be and totally off the wall, too. Novation has almost managed the impossible with Peak, cramming so many features into it. It’s years of creativity in one box.”
Read more about this here: http://www.musictech.net/2017/12/gear-of-the-year-2017-the-best-hardware-instrument/