One thing I'll mention, is that brushed motors require more maintenance and rebuilds, especially for what they get put through with scalers if you run in mud and muck. May want to go brushless if you don't want to do that on a regular basis. I've had to turn down a comm in as little as 6 packs...
Holmes products and service are top notch, I love my Holmes stuff! He can even tell you based on what you want to do with your rig, what it weighs etc what he would recommend. Supershafty's bombproof trannies run HR gearsets, that's good enough for me. Lots of guys on RCC that are way more...