One? You're talking crazy my brutha! Well, with the band I'd have to go with something like the TC Electronics G-system to give me flexibility in fx, routing and programming. By nature, I'm a high gain guy. I can play completely dry if need be. Most of my high sound is dry a lot of the time. That said, effects are the spice of life. I love going from a very wet clean sound to a straight dry high gain sound. I like swirling phaser/vibe type effects the most. Off the top of my head, I might go with Earthquaker Devices the Depths since it can do subtle to extreme chaos. I also like the old blue line 6 modulation modeler.