for paved oval, you cant really go wrong with any mid-grade touring car, provided they have a class for them. a mid-grade tc would be something from associated, kyosho, losi and the like. for the carpet track with jumps, $10 says those jumps are for short course trucks. again, check kyosho, associated and losi. for the dirt, rocks and steep climbs, that sounds like rock crawling and/or racing. big difference between rock crawling and rock racing. find out what they do first then look at the axial offerings. to have competitive setups for all 3, you're looking at $1500-2500 for everything. the first vehicle would be the most expensive, around $800-1000 but then the additional vehicles can use the same batteries, charger and transmitter. you'd just need a receiver, servo and brushless system for each additional vehicle, bringing them to $500-700.