Quote Originally Posted by Owlie View Post
The thing with getting a higher-quality BB is the fact that I'd need new cranks...
Bottom brackets come in different quality levels. You shouldn't need to change your crankset to install a "better" BB - unless you are already using (and wearing out) the better BB's.

Some online research shows that your crankset uses a square taper bottom bracket. Shimano currently offers at least two grades of square taper BBs: The cheaper UN26 and the better UN55 (nee UN54). Sadly, Shimano no longer makes the even better UN7x and UN9x BB's, but many of their features have now been incorporated into the UN5x series. There are other brands too, some cheaper and some better.