I bought the bike new in 2000. I rode it a lot at first, but then life got busy, I got lazy, and then quit. I've decided to begin riding again. I'd really like to go buy a new bike, but that just isn't feasible right now. That said, I can afford to upgrade my bike in small increments. Now, my question is first, how upgradeable is that bike? I know in the long run I might spend more than a new bike, but it won't be a big hit all at once. Any thoughts? As for what I'm wanting to do with it, I'm mainly wanting to do mostly paved, but some light dirt trails too. I appreciate any input. It currently has 7-speed cassette, and grip shift shifters.