i manage ok with e-uae on OSX. it runs perfectly well, there are just a few things that need improvement. Development seems to have stopped, however, which i find frustrating on both OSX and on Linux. (actually more so on Linux because those bugs hinder my usage of it on the PS3)
However, if winuae was ported to OSX i would use it without a doubt, and if you want to offer $1000 and a nice shiney Mac to Toni, then i'll back that 100%