You're not going to get a good basic professional tripod in that range, especially supporting an EX3 with accouterments.
Sachtler has stuff in the $1600 range that would work. Maybe Libec too. I'm not crazy about Bogen/Manfrotto stuff but you could look in that area for a little bit cheaper. Keep in mind weight capacity, balance, pan tilt smoothness. There's nothing like a crappy tripod to make a good camera look cheap. Sorry but you're not going to find something in $600 price range that can hold $10,000 worth of gear. You have to spend proportionally.
One exception. This
Kessler K-Pod might work and it looks to be close to your budget. I haven't used it but I've used other Kessler gear and Eric Kessler is an excellent engineer and has very good prices.
