It is time for me to get another Les Paul. I used to have a 78 Standard, an early 90s standard. It has been 15 years since having one. I hear of R8 and R9 but not sure what that means and hear of 50s and 60s necks. I don't know what kind of necks or what "R" serious they were. I also see traditional and classic series. I'm willing to go up to $3500 if it will retain value. Is there a certain style, a certain time period?