If you're going for a corruptor, your best bet for primary is going to be either Beam Rifle or Sonic. Beam has built in extra -Regen and sonic has extra -resist.
I'm going to argue that Traps makes a better big game hunter than either rad or dark, with purple Patch you're looking at a big hit to the -to-hit that you provide, whereas Traps has FFG. Traps, Rad and Dark will all solo well throughout the leveling up process.
As for illusion. It will be slow but safe. Once you can pick up Deceive you can take out a hard target before aggroing a group. PA and Spectral Terror are really when you start to be able to solo larger spawns.