Any recommendations for gearing?

[skellyo]

I've done quite a few searches on the forum and can't seem to find answers that agree. I've got an E-Maxx that I'm hopping up and about to buy a new motor for. I plan to run a 9920 and probably purchase a 540C 8XL. I'm wanting to run anywhere between 12-16 cells. By the way, I'll be using UE 8 Spyder diffs in FLM Hybrid Bulks, GMaxx single speed conversion and MIP CVD's all around. Any help would be appreciated. I'm really hoping to narrow it down to about 3 different pinion tooth counts. Any suggestions on gearing with using a 66T spur?