One of the best ways to improve your phono cable is to keep it as short as possible. Given that your TT phono sockets and phono inputs on the MacIntosh are right next to each other check if a 1/2 metre interconnect or less will be enough.
It appears you will need RCA to RCA, which means you could use any standard interconnect.
Personally if you want to save money, I found that 12-18" of the old MIT330 with the outer shielding stripped off, leaving you with just a raw twisted pair of time coherent teflon insulated wire, bettered many dedicated phono cables at a fraction of the cost. Spend the extra on quality plugs eg WBT Nextgen or Eichmann.
It appears you will need RCA to RCA, which means you could use any standard interconnect.
Personally if you want to save money, I found that 12-18" of the old MIT330 with the outer shielding stripped off, leaving you with just a raw twisted pair of time coherent teflon insulated wire, bettered many dedicated phono cables at a fraction of the cost. Spend the extra on quality plugs eg WBT Nextgen or Eichmann.