Any of the five Tamiya Shermans are great beginner kits. They all share many parts and are basically the same kits with one turret different (Jumbo) and one upper hull different (M4 Early). Some have figures and new road wheels added, but still contain the original parts as well. Only one that's not that great is their old motorized M4A3E8, but I built it for my son as a carpet crawler. Ones I have:
35122 M4A3 w/75mm (Late)
35139 M4A3E2 Jumbo (exact same kit as above with new turret and add on armor plates)
35190 M4 Early (3-piece tranny cover, new turret, upper hull, and tracks)
35250 M4A3 w/75mm (reworked turret, new road wheels)
35251 M4A3 w/105mm howitzer (reworked turret and howizter specific fittings)