You'll be happier with the MERV I think, unless you're racing I think it's a better all around rig for bashing. You have the Velineon VXL 3m brushless system, and I'm going to be it's a lot faster than you think stock. I personally don't run dual batteries as it only adds runtime, and quite a bit of extra weight. I have my suspension stiffer on the battery side (opposite side of the esc) to compensate for it. Change out the pinion gear (which is marked wrong in the manual BTW, the speed pinion is installed from the factory) unless you'll be running on pavement or hard pack only. I like the Turnigy nano tech 2200's for 2s, and turnigy 1600's for 3s packs. Keep an eye on those motor temps, and congrats!