Need help with a cheap set for doing eliete pvp. Was away since lvl 36 cap.

My questions:
are upgraded mythic sets still good at lvl 41?
how about the ring and pendant? Whats the next best thing to an arcane ring/the new mythic pendant?
What set/items do I need to reach +600dmg with pet? Is it even possible to reach +600 dmg with no arcane ring?