First up, check out Bitwig. I've been hearing a lot of praise for it as something of a 'simpler Ableton', plus it's competitively priced. Also, while Reason seems attractive, I still hear occasional gripes about timing issues from users, although my bet on their problems are that they stem from a computer issue and not necessarily the software. Even so, the tendency makes me a bit jinky of Reason. Bitwig also gives you a more traditional DAW framework, allowing smooth VST integration, which gets into the next part...
Get Silent Way and an Expert Sleepers ES-8. This would then allow you to directly address the modular from within the DAW in CV/gate/trig terms, plus allow four return channels for audio and/or control 'feedback' to the DAW of synth activity. In a small rig with this much architectural complexity, the ES-8 would prove very useful, especially with its ability to reconfigure on the fly via Silent Way + DAW calls.
That's not bad for starters...