I've got a black 5120, that's the first strike against as I'm infatuated with Gretsch's orange color. My 5120 doesn't stay in tune very well, that's the second strike. It also doesn't bring a lot of heat to the party but I can fix that. Should I bother with pickups, locking tuners, and a pro set-up or just upgrade the whole shebang to a 6120? I kinda like the JR's but where do I find a list of the years where a 6120 is actually a 6120JR? Thanks in advance!