Vortex Sound Research

I'm thinking about replacing my keystep 32 with a larger controller. I like the option of having an arpegiator on the controller to interact with the arps on my polysynths but this seems like it's an unusual feature on controllers? But it looks like the Akai mpk261 includes this. Anyone know of any similar devices I should consider or have any experience with the Akai?

Must haves: Close to full size keys Built in arp At least 49 keys but preferably 61

This would be controlling a Novation Peak and ASM Hydrasynth via a Bastl midi looper. Don't care about drum pads or midi mapping, program changes etc.