Heinrich, welcome to the club.

Unfortunately, there is no arranger out there that would be good for that type of music. (I've been there, done that). You're in the same boat, bro. I don't know about new breed (i.e. Tyros, Genesis, kn7000 etc.) but from what I heard they are suited for everything except hip-hop, r&b, dance or techno. I mean they have a few styles on this and some good synth sounds... But not enough to produce a good dozen of this type of songs. No arp, no good real time controls, you can't mute this hihat and make louder that SD or BD. You can do it with cakewalk and such though. Drum kits? Forget about it. If you're into hip-hop for example you'll find 1 or 2 drum kits for that and even they are not "into your face" if u know what I mean. I've always asked myself:

- why reinventing the wheel and modify lets say Triton or Motif to be an arranger?

- why there is no or ever was an arranger for modern dance music? (please, Yamaha's DJX or whatever doesn't count at all. It’s for kids only)

The only good one out there is Korg PA series. Has really good techno and hip-hop sounds. But very VERY little. Drums? Same. But more than other arrangers I think. Tweaking sounds and muting single percussion stuff here and there? No way.

What a shame.