Outrunner CRT.5

[BL-Power]

You are completly right, it's smooth, light-weight, quiet and powerful but not very durable under real offroad conditions. It's not to expensive, if you've already got a ESC and a battery you have to spend around 50$ for the motor and some small parts like cups, dogbones and a motor mount. If it works stable under the conditions of your driving spot, you can keep and have a lot of fun. If you've got problems with it, you don't have lost too much and you can use your inrunner again.
The Kyosho gear is quite durable, i don't think it will be damaged.