Hardware sequencers that sequence chords from synths in a no-nonsense way

Hi,

I'm looking for recommendations for affordable (I hope) sequencers that will easily (I hope) allow me to string together a drum machine and two synths, one of which doesn't have an onboard sequencer. I'd like to be able to play in the part to a clock — with chords! — and have it play back without glitchy note erasure, etc. Ideally there would be quantized and unquantized playback, but unquantized is not important. Handling polyphony is the main thing.

Are there any machines that work in a straightforward, fun way and that aren't a nightmare to learn and remember how to use?

Thanks.