Hi Tom,
working on an hiphop orientated live case myself..
don't mind me asking why go this route instead of getting a MPC for instance?
I am not seeing the extra things what this setup will bring you.
Not a lot of modulation options and besides the per4mer (that I love) not a lot of playability either..

My humble 5cts: get a 6u with some utilities, filter, delay/reverb thingy.. makes is all more versatile plus more fun to play around with in an accessible way.
Got myself a Feedback Modules Squeeze (4hp compressor) to glue the samples together a bit #recommendation

good luck