Get mx vs atv. Either mx alive or reflex. It's off road and has lots of jumps. This will help your timing skills and ability to find lines threw jump sections. If you want the more RC experience use an atv in the game. This will help you to correct the vehicle in the air and line up corners. It's also one of the beat off road games out there.
The mx bs atv reflex can be found for around $20
The new mx bs atv alive is $40, you ask is the $20 worth it. I say reflex will suite you just fine.