Someone sent me pictures of the new Alpha base clamps, they do look similar to the Prince 5000/6000 clamps. I don't know why they don't use them on the 1500. Another source told me Prince, Gamma and Alpha get some of their parts from the same manufacturer. The new Gamma string clamps look very similar to the Alpha and Prince string clamps.
I know a few people who own the 1500, and haven't complained about the base clamps. Many of them are former Eagnas owners with the switch-action clamps, that had problems after some time.
Honestly, any of the machines would be good. It's all up to you.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual