Ableton Forum

These look good:

http://www.dtronics.net/html/midi_thru_box.html

I'd go with a modular, but of course it all depends on whether you think it would suit the way you work. If you truly enjoy sound creation though, you can't do better than a modular. $3000 would let you put together a very nice system. I went the modular route about a year ago, and I haven't looked ...