I am currently an undergrad at UGA and there are several that have recently marched DCI. These are the ones I know of. Including myself, I know of eleven that have marched Carolina Crown (including a drum major). I also know of four Cadets, several from Spirit, one from Capital Regiment, five or six Cavaliers (including a field conductor, but not the Drum Major from 2001 and 2003), one went to Vanguard, one went to Blue Devils, four went to Phantom (including the 2003 conductor), one from colts, one went to magic (one of the drum majors in 2005?), and a handful of open class members. It is also cool to note that of the four band directors one marched Madison 81-84, another marched Phantom 91-94 and was conductor at some point, and another marched Cadets 88-90 and I think he was the trumpet soloist in the 1990 show. Also, a former director marched Blue Knights in the early 90s. UGA also has had a handful of corps staff.
Hope that helps.