I have been playing with the possibilities that arise as a result of using brushless and smaller lipos, specifically the LRP super shorty. The original concept was to centralise the mass and as a result I have gotten a ridiculously light car that handles VERY well. I took the car that I designed for low traction dirt and it actually works fairly well on carpet. I am currently building a purpose build carpet car with very low center of gravity. Here is the build thread.
http://www.rctech.net/forum/electric...-tlr-22-a.html Here is the car minus the front wing. The car is currently 1390g on the track. Had it down to 1365g but I am sorting out some servo issues that will take some time.

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Really like the idea of a 380 motor because I am building a custom motor plate / shock tower for my new carpet car. That would make the car insanely light!!!! With a little work I could easily get the car down to 1200g or less, saving almost 100g just on the motor.
P.S. And yes, I'm running the lightest rear springs!