The plan is to finish completion on Act 6 today. I have a fully formed T5 Mutant Catalyst and right now my best 6* Mutant options I believe are Domino and Sunspot.
I have suicides unlocked, but I don't run them all the time. I have a 5* Masacre at R4 and a 6* RHulk at R1. I use my 6* R2 Warlock all the time and hope to have him as my next R3. In the near term, I'm more interested in jumping into Act 7 than fully exploring Act 6. Who should I take up first?