Lord - I think that's a "volute" you're referring to. You should've been a Yamaha salesman !

Incidents - just a suggestion, make sure you play your potential new guitars thru a RI Deluxe Reverb ( yours or the store's ) so that you make an informed purchase. You may find that humbuckers sound a little "muddy" compared to single coils (Strat, Tele) through that amp. Don't settle on a particular guitar before you've tried some different ones. Take your time, try out as many as you can, narrow the choice down until you're sure you got the right one for you. Since you're trying to emulate Jerry Garcia's sound, you may find the combo of a Fender guitar and Fender amp gets you close. Try the Strat, try the Tele, try the SG, try the Les Paul - you get my drift - and good luck.