I've been using an MPC1000 for sequencing lately too, and it has 32 midi channels spread over 2 independent midi outputs. For the amount of gear you list I would recommend that you keep things as simple as possible.
I have tried an endless series of midi patchers, patchbays and thru boxes over the years and have finally come back to using the midi thru to hook up downstream midi modules. It seems very attractive at first to have the ability to patch anything anywhere, but I realized after a while I was just using a small number --- like maybe two or three --- of the available memories. And the myth that midi data gets delayed when you string two modules together is just that - a myth.
For example, you could hook up your Micron (which is only 8 voice) and your Motif ES to output A, then route output B into the digital 8 track, then out the thru of that into the computer to control Reason. The advantage to doing it this way is that all you need to do to select a different instrument is dial up the appropriate track on a properly set up MPC1000 song template.
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