I saw a used RG1570 for $450 at a local shop. It's grey with serial number f0237359 (Does this mean it's a 2002?). Anyway it has a few dings and a little rust around the pickups and bridge (both appear stock). I realize playing and hearing it are most important, but does that sound like it's worth buying? If not, I also saw a RGR420EX for $400 in great condition.