Darren
You are highly unlikely to get 1 brushed motor that will perform the same speed on 4 cells as 1c lipo. The only way to do it was to get a motor that was fast enough for the lipo guys, it would then be to fact for the 4 cell users, and assuming they actually drove it it should work out at much the same speed.
Alternatively, what we did was use the Mardave G2 brushless, but limit the speedo's to 80% when using 4 cell, but allow 100% with 1C lipo, it's as close as you get, you can obviously tweek the % value to suit. Don't worry about people cheeting, it's fairly obvious and takes all of 30 seconds to check.
As you may have guessed there does appear to be a move to 1C lipo with brushless sensor motors, probably 13.5, these seem to match the brushed G2 motor on 4 cell pretty close, but remember both are slower than the Mardave G2 brushless on 100% on 4 cell. I would suggets holding off just now and do some testing, I can see a gradual move to 1C lipo and 13.5 coming, the problem will be around the different 13.5 motors, and the fact that some can have adjustable timing on the motor. Running blinky speedo's should even them out.
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