I've run the ARE-1 & a Master smacker (same drivetrain as the ARE-2) with a 9t ezrun system & both cars have coped well.
For the ARE-2 the only upgrade you would need would be to change the brass pinion for a Tamiya one (the tamiya is the same pitch) as the brass one wouldn't cope well with the power of brushless so you will notice some colouration on the spur gear as the brass wears. The spur will wear over time, but should last a good while if you keep your eye on the mesh as a badly meshed spur will not last.
The biggest problem you will probably find with the increased power is the driveshafts (at the wheel & at the diff end) are under more strain so the plastic may weaken over time, but at least the spare parts are cheap enough.
The car is noisy & to fit a metal spur would just make it worse. I can't see any reason to fit a metal spur, so long as the mesh is done properly then this isn't a problem, sometimes it's tempting to adjust the mesh to try to take some of the noise away but all you will end up doing is stripping the spur. If you do buy Tamiya pinions, chances are you will get 2 in the packet (such as a 23 & a 22), so for example you could use the bigger of the 2 to set the mesh by fitting the larger of the 2 pinions with a tight mesh by moving the motor on it's mount, then once set remove the larger pinion & fit the smaller of the 2 which should give the right amount of slop.
Hope this helps.
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