I need a new chain tool, but I'm not sure what to get. I keep breaking the cheap Sunlite and Wal-Mart chain tools I get after only a few uses (if they don't break on the first try,) so I figure it's worth investing in a better chain tool given how often I plan to use it. I need something that I can use on at least regular single-speed chain, and 5-12 or whatever multispeed derailleur chain, too. If I can get something good for less than $50, that'd be even better. So, what do you use, and what would you recommend?