No use for attenuaters and attenuverters? That made me laugh.
As far as sequencers. I like the 1010 Music Toolbox. But right now the firmware is trying to their BlackBox and isn't quite ready for prime-time in my opinion. I have a Toolbox. I like it, but it's not quite "there" at the moment. But the architecture is pretty nice and flexible.
I would look into a Westlicht Performer. You can find them for around $300US and it's the "Eloquencer Killer." Not sure if that's true but I've considered getting one for the workflow.