Hi!  I'm looking to get my son interested in mountain biking and myself back out on the trail.  I have an old specialized rockhopper (22 years old) It's heavy and outdated, but unfortunately I don't have a lot of money to spend.  I'm trying to decide between the cannondale trail 3 and 4.  I am only 4'11, and pretty out of shape.  I need help with climbing.  I understand that the more expensive bike is a better, bike, but since money is an issue for me, I want to make sure that the difference in discernible and that the way it's better is in it's ability to help me climb.  I'm not planning on going fast or tearing down single tracks, or doing jumps or features.  I'm a chicken really and just want to be able to ride beginner to intermediate level trails without dying half way up. I do realize that the majority of that's on me and my fitness, but I think the bike can help a bit.  So--- is the difference between the 3 and 4 significant in terms of climbing?