Break it down. The SL series is the best value for the dollar. The SL 1600 is fully automatic/1700 is semi-automatic version and SL 1800 is the fully manual version. All have the same motor/suspension The SL 3300 series is the other bargain. 3350/3360 they are the ones with the adjustable speed control. Good bearings and good motor. Same arm. The SL 1900 is the best but very rare. For the SL 1600 which is the same as the SL 1500 you should not pay more than 100/120$ Thats a good working condition model. For the SL 3300 series I would say unless it has a good cartridge I would not exceed 90$. There are other decent models but those are what I am familiar with. I just bought my SL 1600 in Janurary for 118$ on e-bay with a new shure cartridge in it. It is in immaculate shape and sounds great.