Best camera choice for tracking? Who's a front runner right now?

It's been a while since I've shopped around for good tracking cameras. I know theres random threads around here but some are outdated info. Does anyone have a feel on what the best options out there are right now?

I'm looking for one with a low f-stop and preferably interchangeable lenses, but definitely one that has good wide angle lens options. This would be for a ceiling mount pointing down.

Firewire wouldn't be a good option because of cable length limitations, but I guess RCA or SDI would work.

Really any thing you've seen around would be helpful, or a good online vendor to look at. Not necessarily needing a point grey or anything like that.