Most of my corr's get the mace mastery shield just because it makes getting close to softcap so much easier.
My Sonic/Dark got Ghost widow for power boost though for all the mezzy awesomeness.
Well, you only have to do one patron arc to unlock all of them and I'm sure you can have different sets on the separate builds.
As far as which to pick, I would definitely go Mace Mastery for softcapped S/L/E defense.
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For giggles, my Fire/Dark corruptor went Dark Mastery. Soul Drain for some damage boost, proceed to nuke on a tar patch, with a Dark Consumption chaser to get my end bar fixed up. Having the self-heal makes my corruptor a bit more reckless about defense capping. I do know that I can burn down a lot of cimerorans fast in the ITF. Fluffy is good cover for nuking, too.
Edit: for a cold secondary, I would definitely go for the scorpion shield. You have your own little nuking machine with sleet, blizzard, pop a blue, heat loss (or if there are enough targets, you can almost get a crashless nuke from heat loss).
Triumphant Defenders Forever
Psylenz FF/Psi, ArticQuark Storm/Rad, Symon BarSisyphus Bots/psn, Max VanSydow Thugs/Dk, Cyclone Symon Bots/stm, Blue Loki Ice/Cd, Widow 46526
HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.
I'm curious what percentage of corruptors take Scorpion APP just for the def shield?
I'm debating APP choice for an Ice/cold. Certainly I recognize scoprion shield puts you leagues ahead.
But some of the other sets have some really good powers that I can assume would be very handy too. Like the Soul Mastery set has that amazing little power boost ability to really add salt into the wounds of all my debuffs.
And of course Leviathan has hibernate which is the closest thematic choice to the ice/cold build.
SO. Aside from the general curiousity of what people are picking.
Can you use the multiple builds to have Multiple APP sets on the villain side? I know you have to go through those quests though, which makes the villain APP so much more restrictive. GRRR.
Anyway I hope you can.