Opinions are like A-holes, we all got one. You just gotta determine whose A-hole smells freshest...
I've ridden all those except the Moomba and Centurion. The Sanger has a huge wake and great quality, plus its a year newer. The Supra has a wake much like the old X2, big solid and awesome, Supra is top notch too. Not a huge fan of the MB, in all departments. The Mastercraft X-30 does not have a good wake, its a nice boat but not for a serious rider. The Calabria is decent, has a good wake, tons of room but not quite as nice as the other. So theres my take, good luck, either way you are getting a boat & I am jealous. Have fun.