Use Bugfix 2.0.0 as a first attempt. That will be the main branch going forward. It should compile every option you specify for AVR's. Some of the 32-bit platforms still need some work to compile.
If you run into a problem getting your setup to compile, please post a message and somebody will jump on it and get it to compile correctly.
The goal is to get 32-bit processors to support the entire set of options in the 8-bit branch. Probably what happens over time is the 8-bit boards can't run every option the 32-bit boards can.
