IMO - the Heng Long 6.0 board is comparable to the Taigen system these days and a little cheaper by my research - so my money would probs be on 6.0
There are better systems on the market than either of them, but then you start to pay a lot more as well (ie ElMod, IBU, Clark etc.).
Looking forward to seeing some pics. Someone with your experience would have gathered some modelling wisdom over the years. I am also a German armour fan. Love the King Tiger.