I'm going to assume the best is an Arcane pet. Please let me know if I'm wrong on that :P.

I currently have a bit over 4m. I could push that up to 4.5m pretty quickly and easily. I just bought Glint Aegis of Grit, and have an arcane ring crafting. I could go for a pet and/or belt next. I want to mostly tank, especially elites, with maybe a small amount of PvP in the future.

Currently I have no Arcane pets, and my only Mythic pet is Slag. What should I buy or save for?

Thanks.