Go for the cocker, just about every problem has a detailed explanation on how to fix it, and providing you "READ THE MANUAL, ETC", then they are no problem at all.
The biggest problem with cockers is that people "think" they know what they are doing and just start to fiddle with them until they no longer work and then they call them a crap gun because they didn't read up on them first
When they are set up right they are a magnificent gun that will serve you well for years to come, and lets be honest, what parts are you gonna need apart from maybe an E2 noid?
The Ion by the way will simply dissintegrate in your hands while your playing
And no i'm not biased, i have both a cocker and an ion, and there is just no comparison in my opinion.
Think BMW vs NISSAN
Ps, USE A HALO/RELOADER/PULSE/VELOCITY. eggs, revvys, etc just don't cut it