I have used GM modules exclusively and had good performance from them- but then again, I wasn't running boost. On any high performance engine I've personally had anything to do with ignition-wise, I've always opted for an MSD 6-series box and removed the module entirely. I'd have to recommend the same thing for you. A BTM would be a good addition as well.
If you're bound to keep the module, I have heard reports that the MSD was a good module. Accel doesn't get good reviews in general, but I haven't heard anything about their modules one way or the other.
MSD HEI module w/built in rev limiter.
One of the best set-ups I've found for the GM big cap HEI is to use an external coil (takes a different coil cover made for the purpose) along w/the MSD 6-series box.
Below is the Mallory unit (similar to the Jacobs), whether the $50(!) price is worth it remains to be seen.
