try to get a Deluge Second Hand. Might be unter 800 bucks. You won’t get more power into such a small device.
It really depends on your workflow. Circuit Tracks and the just announces Rythm might be enough for you to make music.
Tablet is enough to make albums full of music too!
MPC One + myVolts Cable is under 800 bucks!
Digitone + myVolts Cable is under 800 bucks!
Digitakt + myVolts Cable is under 800 bucks as well.
1010 Blackbox is within the budget too. Not many smaller devices that powerful out there.
As the Polyend Tracker is already mentioned: M8 is small as hell!
I am using MPC One + Micromonsta 2 in my camper van a lot, but that’s above your budget.
But really, for someone who is okay working on a touch screen, go with the Tablet. Bitwig on Windows-Tablet or AUM+Plugins (Drambo alone can be enough for years!).