I just ordered two sets of Hella Supertone horns from Susquehanna MotorSports. The list price was $65.50 per pair, but they have a 10% holiday discount through the end of the year. Total with shipping was only $126 for the two sets. http://www.Rallylights.com/hella/horns.asp listed at the bottom of the page. These are the flatter "pancake" design, it looks like I'll have no problem getting them under the tank on the GS. I currently have FIAMMs up front, mounted on the "tire lever" Zander bar (hello, Chuck). They're much better than stock, but I would like a more discreet placement. The Hellas are even louder than the FIAAMs. Just a happy customer, no affiliation.