Hi,
Well there are many ways you can do this, take a look at some of the following, they all should do what you need but vary in cost.
DVD Express which is a usb solution
also look at dvd express2
DVD recorder
another option would be a 1394 fireware card, Premerie Pro if you have the budget will allow you to edit the video and burn it straight to dvd, if you want to create a dvd with menus, and chapters etc then something like Adobe Encore would do the job.
So a few options there, all would work on your system quite happily, its just a case of what budget you have and what your looking to do.
i hope this helps