Which M60 kit you get depends on when you want it to depict. The AFV Club ones are the best currently on the market. The Esci (Italeri, Revell reboxes) were the best up until AFV Club's offerings. The older Tamiya and Academy ones can come out nicely as well with a little extra work.
The M60A1 kits (not the Tamiya USMC version w/ERA) represent ones used from about '64 to about '80 by the US Army and up to the early '90s by the USMC. In the mid to late 70's most of these were upgraded to M60A1 RISE/Passive with upgraded engines, top-loading air filters, smoke grenade launchers and their stowage boxes, and a few other parts (RISE - Reliability Improvement of Selected Equipment) and IR sights (Passive). These were used all over Europe and with many US allies.
The M60A3 was a further upgrade introduced in 1978. It included the addition of smoke grenade launchers, a thermal shroud for the main gun and a new rangefinder and ballistic computer with meteorological sensor on the turret roof. Soon after its introduction a new sub-variant entered service. The M60A3 with Tank Thermal Sight (TTS). It incorporated a hybrid solid-state ballistic computer, laser rangefinder, and a turret stabilization system. The M60A3 was primarily a US Army version used from the early '80s into the early '90s across Europe and in Operation Desert Storm. A few (one Bn's worth) of M60A3TTS were also given to the USMC for use in ODS to augment their M60A1 RISE/Passive tanks w/ERA (as in the Tamiya kit shown below).
This version was specifically a USMC M60A1 RISE/Passive used in ODS.

If you leave the ERA off and relocate the smoke grenade storage boxes to the upper rear sides of the turret, it could also represent a late US Army M60A1 RISE/Passive as well.