All new (2009+) spool electros feel the same to me. Sure, there are slight differences, but they're all pretty much the same. That's not a bad thing. They're nearly perfect.

For that reason, my current approach to my collection is one or two different newer spools and the rest old school. Old school markers are so much more customizable and tinker-ready.

Mech cocker is my vote, but there's nothing wrong with building a substantial mag collection either.