I you're putting flea market specials on your $300 car and considering buying a $1000 rc something is wrong.
Two things you never skimp on is brakes and tires.
flea market specials?
not every body drives those over priced gigantic SUV's, or high end sports cars that require $150-200 tires...
Also sometimes you can get some good deals going to the used tire shops like when I blew my one I bought a used tire for $35(mounted) which was a BF goodrich that still had the little pins on it from when it was brand new(I don't shop there often in fact that was the 1st and only time).
Also I was saying the price of the tire not the fees for disposal, mounting, city wallet reaming fees, etc which will jack it up quite a bit.
As for its powering its a SAVAGE FLUX extended should only weigh a tiny bit more due to the extra length. Same gearing same everything. If you have a savage flux just get the conversion kit from TCS, and presto you have this (but better engineered IMO)