The DA is by far the cream of the crop! The BME and 3W(w/new ignition!) are great also. I personally do not care for the older Brison's(timing collar). The Zenoah's, Fuji's and such have their place in scale warbirds but the electronic ignition models are preferred in acrobatics.
I absolutely love my DA-50(GP Christen Eagle) but I am also quite fond of my 3W-75(AW 31% Edge). I have flown BME's(excellent) and Brison's(good). While the rear carb models have better air flow, they are quite a pain sometimes for setup. The side carb models may have air flow problems but are much easier to set up throttle and choke. Your choice is tough but with the Pitts, lite is good....