LST on 6s, What motor size?

[Crazy L]

As per title, I'm working on a brushless conversion of my old Champion/Wong bothering LST, I had planned on either 4 or 6s, so am after a guide as to what motors to use for these cell counts respectively. I have only one 6s pack but have two 4s packs and another 4 sets of 2s I can use for 4s duties. But would like to use the 6s too.

Any recommendations and /or advice would be apprec'd.

Ta muchly