<$1k Depends on how new you’re considering? Behringer DeepMind, Volca Keys, DSI Tetra & Mopho x4,
Midrange: Novation Peak, Dreadbox Abyss, Vermona PerFourmer
Fancy Stuff: Modal 008
Not sure about the things that set them apart, necessarily, if you’re just talking price range. More options per voice, perhaps, such as waveform selection, filter types/slopes, number of filters or oscillators, number of envelopes/LFOs/modulators. Maybe certain companies have things that set themselves apart, like Dreadbox with the way the effects integrate and the interface.
I’m happy with my vanilla and cheap option, personally.