Any luck with job search engines for hiring?

We're a startup in Waterloo, Ontario and we're looking to hire computer vision developers. Has anyone had luck with job search engine sites like monster.com and workopolis.com? Any other sources of brains?

By the way, if you're looking for a job and are ridiculously smart, send me an email. We just got series A funding and are still giving out serious stock option plans to new hires. Contact at imridiculouslysmart at gmail dot com. (Yeah I just registered that.)