Mt. Bike computers

Hi, I'm new here so I'm sorry if this question has been answered before. I am getting back into mountain biking after being off for a few years and was wondering what kind of computer will give me the most for my money. Im not looking for all the bells and whistles, just odometer, trip odometer, top speed, average speed and a clock would be good. It has to be something durable and waterproof as I'm not too gentle on my stuff.
Thanks,

Kudu40

get a cheap sigma sport computer like the 906 or something like that. I've had one on my mtn bike and it works great