I too am in the infancy stage of perf mods.  I strongly recommend the differential brace before racing with DRs just in case, this was my first mod.  I looking at a drag set up and changing my gears from 2.62 to 3.09 just not sure its worth it.  Also, thinking about installing the demon springs pending more research.  I guess it depends on your performance goal as mentioned by PRHC.