How is your tank micro? If you are good with Shermans then you will do well with 3 or 4 PIVs in your army. However if you're more of an infantry kind of guy then you should have a few more support weapons in your army and less tanks (maybe none at all).
lol?
wehr without tanks is like bear without claws,
if your tank micro sucks spam pumas, and do not get panther becasue it's cool it requires support and is not good choice for starting wehr player if you dont know how to micro tanks.