Masterless works fine for all 3 classes. The extra life/zerk, or quick Int or quick medipacks makes it a pretty doable run. Not easy, but doable. Speedloaders are a pretty reliable pistol to build for, but throwing bulk mods onto pistols works fairly well as well. It depends on your EE level at the time.
Or just go for MSs or MGK. While you're at it, make a storm-bolter. Because we all get the mods for them every game, often enough for two or three of them. /sarcasm
But for reliability, just go for masterless and speedloaders/bulks. It'll get you to the end. Just.