Yup, was a drafter for about 5 years (now a programmer, in Java). Used AutoCad r. 10, 12, 13, 14 and a tad bit of 2000. 2000's great, mostly cosmetic stuff, a tad faster than 14, but it's 3d capabilities are vastly improved (if your into that kind of stuff).
If your not into 3D, save your cash, 14 is simply awesome for your everyday needs.
To whoever recommended ProE. That would not be a wise business decision. Although you may prefer it's interface to that of AutoCad's, there is NO CAD package out there that can match AutoCad's functionality, features, ease of use, acceptance and support. None! 90% of the CAD world USES AutoCad. 'nuff said!