I have a 2008 Aurora Elite and if I recall it's a 53cm. Jamis, at least back in 2008, sized their bikes by the height of the seat tube rather than the more common method of measuring the effective top tube length. The bike I have has a 56cm top tube. So if you're 5'-8" tall, it may not fit you very well. That said, the Elite frame is a weird geometry - if I could go back 12 years given what I know about bikes now, I wouldn't buy it again. That said, mine has been re-incarnated twice in the years since. The only thing original is the frame and fork.
I can't comment on any differences between the Aurora and Aurora Elite.