Didn't want to shell out for the pricey crimp tool, so I've been using the CAT6 EZ-RJ45 connectors with these $13 TRENDnet crimpers fine - just that I have to manually snip the leads and pull the cable back a bit by hand before crimping.
Amazon.com: TRENDnet 8P/RJ-45 and 6P/RJ-12, RJ-11 Crimp...