+1on Frank, RS400 and RC-link remote.Keep in mind that Frank at Drago's Bike Works also sells Hawg Wired stuff. He's typically got great prices on it. That's where I bought my RS400s and RC-Link remote. If you give him a call, he'll set you up with a great deal.
Any first hand experience using Hawg Wired AMPs, maybe their RS400, and V-Twin customer support let me know what you think. Thinking of using the RS400 AMP.