I'm seeing a lot of personal "wants" and not many AH2 "needs". The current gv game has a lot of gaps. It does not have a legit tank destroyer and it does not have a legit direct fire support vehicle.
I'd say a TD such as the M10, M18, or the non-turreted Jagdpanzer (much would depend on the amount of swivel the gun has and how good the optics are) is needed prior to adding in any more tanks. I'll vouch for the M18.
Also, an M3 halftrack with the 75mm cannon or the Sdkfz 251/9 with the 7.5cm cannon for HE support (both would be very much like the LVT4 but much faster) would fit the bill nicely. The 251 is a bit more stout than the M3, so it would fair batter vs enemy fire. The Priest or Saxon with the 105mm cannon would be good too. I'll vouch for the 251/9.