Most people use the Forge BOV. I would say it's the easiest given that it's a drop in replacement for the stock BPV. Anything else (like an SSQV) and you'll need a block off plate and to get a charge tube with the right flange.
How loud is the BOV, I'm thinking of getting one but I don't want it too loud. Or am I better off just getting a CAI which will allow you to hear the BOV anyway....