I'd look at the Taigen, Their customer service is fantastic and they visit this forum regularly. Also just my opinion, but all metal is over rated. It IS key to have metal at certain points such as the drivetrain, sprocets, idlers, gearbox mounts. This rest
is just not necessary and adds more work for the gearboxes and running gear to deal with especially metal tracks. It's also harder to model if you ever want to change the exterior look down the road. If you find a tank you like and it happens to be all metal, by all means grab it. Just don't think it has to be all metal to mechanically dependable. Where are you located? There may be someone local for you to meet up with.