Roland SP 404, perfect for one shots, loops, the built in FX are decent and work best when not over done, and the built in sequencer is not that good but if you pair it with a Beatstep Pro it really comes alive.
Ableton w/ Novation Launchpad, I use this for longer playback samples and backing tracks. You could use it to do what the SP does and a whole hell of a lot more but I just keep it simple as far as playback goes.
Zoom R8, digital 8 track w/ built in mic and it also doubles as an audio interface. I used it live a bunch and I can play full songs with it, weaving samples in and out.
Elektron Digitakt, this thing is awesome, straight up. One part drum machine, one part sampler, and one part midi sequencer. Outside of Ableton this is the most power sampler and when you pair the Digitakt with the SP 404 the possibilities are endless. There is a bit of menu diving but once you familiarize yourself with the Elektron language its a breeze.