Choose my motor!!

[Skelbow]

Building a custom Twin Force project...

-Custom lengthened chassis
-Hardened driveshafts from RC Alloys
-Hardened ring/pinions
-Dace adpaters with 40 series Mashers/Cheyenne Rims
-Custom Cantilevers with UE Supermaxx shocks
-Custom center tranny parts, machined a Jato Slipper/Spur setup to work

Now.. I'll be running a MMM (when the new run is released) and 6s 5000 MaH Zippy-H packs

Truck weighs 10 Lbs with everything except the motor basically. Scale is only accurate to .5 lbs, so say 10-10.5 lbs + motor

I am really looking at the Neu 1521/1Y/F (will have to redo center tranny, because I don't think the fins will clear as it is now)

I have read a couple posts, and I agree with what I saw Lutach say, that because it will have so much torque, the amp draw should be less to do the same work as say a 1515 sized Neu.

So my question is... should I switch and go for a 1515/2.5D or just say screw it and go for it all with the 1521/1Y? I figure I can always turn the settings down if it is too crazy. The 1521 is only like $20 more... so it really has nothing to do with cost. I am just curious if my runtime would be getter with a 1515 vs a 1521 or does it really matter..

Thanks!
-Cory