If you are worried about how reliable DSM's are, I would not recommend an FD. I would recommend an FC. Mazsport is the best tuner shop and they are located in Largo. I have a race bred FD. I expect my next rebuild to happen at 30K miles if I keep my current tune (250rwhp). However on my next tune I expect 500rwhp and the rebuild then becomes necessary around the 15,000 mile mark (or less). This however is not my DD and it will take more then 4000 laps at Sebring before I need a rebuild. I am usually good for 50 laps per event so it will take at least 80 events before I need to start worrying.
As for a dailey driver, I have another Mazda. It sounds like you are looking for a DD with some pop. Buy an FC. Read this thread ->
Link.