I am reviving my vinyl from the 60's and 70's. Classical, jazz as well as classic rock. I have an older Marantz 6350Q TT that I believe only needs a new stylus. I also have the opportunity to acquire a Dual 721 Direct Drive TT with a Shure 15 III series cartridge, also needing a stylus. I need help in deciding which unit will produce the best sound when attached to a upper range mid-fi system. Any opinions would be greatly appreciated.