Sounds like a good watch, paks "unbeatable" stug spam is always great arena food.
M18
Same as M10. Though be careful with their range thosw nasty AP round m18s. Dont chase they outrange you. Fight em on your terms and with some PAK support. Most people cant use em lol so you dont have to worry much about em...till someone figures them out.
i did post something about them in my guide. he is the only person running those AP round hellcats from what i can see. Otherwise the game goes another way.