I like the Fab Filter Pro Q -
http://www.fabfilter.com/products/pro-q-2-equalizer-plug-inIt's not cheap, but it's hard to see how you would need any other EQ, unless you want a 'colouring' one. It's simple to use but with a lot of options so it grows in line with your needs.
Having said that, the Sonitus EQ that comes with Sonar is perfectly capable (if a bit ugly and lacking a spectrum analyser) and people say good things about the ProChannel EQ, if you're happy with the ProChannel workflow.