Timing belt

Does it matter what kind of timing belt i get? it is time to change the timing belt, and i dont wanna pay a rediculous price at the dealer, and i doubt that my mechanic will be using the oem belt. is the aftermarket belt not as good as the oem? or is a belt a belt? also an after market water pump is better than oem right? i heard vw uses aluminum instead of metal on there water pumps.

Yes, it matters. Yes the VW belt is better. Oh, and aluminum is metal... vw uses plastic on their water pumps.

ohhhh yea....aluminum/metal never paid atteniton in chemistry. so go after market water pump? also if i buy the vw timing belt, will i also have to buy the vw tensioner? how much will the two cost me?