I think the most fun German TD is the Marder II- got a 9 kill run on it on my old account (restarted after I got sick of a bunch of the guys I had been playing with). The German mediums, especially the Pz III and the Pz III/IV are a blast, but from my experience before restarting, anything higher than the VK series of experimentals lose so much money when you lose the battle without a premium account that they ruin you- I went bankrupt less than a week after I got my Panther, and I never got enough xp to upgrade it much. Thing was a shell magnet in every battle, and the matches it got put into, the stock 75 bounced off everything. It was the Leo all over again.