Which motor for xxxt on 8 cells?

[Gustav]

i'm having trouble deciding which motor to use in my MF2 on 8 gp2200s so i'd appreciate your thoughts guys.

8 cells will likely be the max cells i'll use in this case as they fit nicely in the truck under the stock battery strap for a neat installation.

The truck is very light so i was thinking either basic 4200 or basic 5300.It seems as though the 4200 is most ideal at slightly higher voltage and the 5300 at slightly lower?

Also,should i be considering a basic xl series, perhaps xl5000.

i've been running an ss5800 on 6 matched peak racing world spec gp3700s with 18/86 gearing but i'd like more power and top speed.

At the moment i'm thinking to go with basic 4200 with higher gearing.

I think that about covers it,as always i appreciate your advise,thank you.