I can't tell you if KMs are any good but if you wanted a buggy and money wont be an issue get a HPI baja or you could get one of these for your losi http://www.davesmoto...it.A/id.9721/.f
It will be very hard to destroy the losi I barrel rolled mine full speed into a wooden fence at a track the other week it took it like nothing had happend. It is the toughest RC I own and I have owned a few. Save the money for upgrades or spares just incase.
Here is where I get most of my parts http://www.freeprawn...t-parts-hopups/
Here is the kill switch http://www.freeprawn...ombo-tr210.html
I use two of these http://www.freeprawn...v-sv0236mg.html one on the seering and one for throttle and breaks.
Kill switch I have the killer RC super bee, Tuned pipe the samba pipe is a very good pipe but expensive. Put some money by for some servos the stock ones do burn up eventually.