I have a 1996 Trek 850 mountain bike. It is pretty much stock, and as such, does not have a front suspension fork. I'm interested now in having a bike with a front suspension fork. My question is, are there any front suspension forks out there that are cheap but good enough to buy and install on my Trek 850, without it approaching the price of what a new, comparable bike would cost? Right now, I only go places you could consider "real mountain biking" maybe 4 times per year. But when I do go, I'd like to have a bike and a suspension to make it worthwhile. As far as my Trek 850 mechanically, it works pretty well. It just has a minor shifting problem that could probably be fixed by a decent mechanic. So should I spend between $350 and $500 for a new bike, with a suspension, and of course will all new and clean components, or add a suspension to my 7 year old bike? Thanks for any comments.