I am having some trouble with my crank. I talked to the bike store and they said it sounds like the bearings inside are going out. Right now I have a 10 year old Jamis Durango - with a Shimano crank - most likely bottom of the line. I want to replace it with something that is good, but definitely not the best of anything. Does anyone have any suggestions? Also, is it worth fixing a bike like this or should I look at a new one?