We currently have here:-
TR-606 - very unique sounding little box & battery portable. Like it a lot, but would like to get separate outputs fitted.
SDS-9 - analogue Simmons toms, cool midi spec, snare & rimshot on swappable eprom, weird/odd digital (software) kick & built like a tank.
Rack Attack - Great sounding & seriously powerful drum synth in a 2u rack. Comes up with crackpot sounds & noises when you hit randomize.
MachineDrum Mk1 (SPS-1) - Without a doubt, the best drum machine/groovebox I've ever used. Words can't describe how cool this machine is.
Fahrenheit (on Soundart Chameleon) - 808, 909 & 303 clone as a Chameleon Soundskin. Basically it's a bit like rebirth in a 1u rack without the sequencing. Very cool.
Got loads of other gear that's really useful for drum synthesis, but you could write an essay about it.
I'm tempted to comment on drum machines we use to have, but we're starving here & I'm cooking the food.