Nearest "equivalent version" of AutoCAD to DraftSight v1R2?

In addition to the resources available from Dassault Systemes, there are lots of potentially applicable AutoCAD resouces on the net. However, I'd like to avoid needless confusion by limiting what I read to those referencing the closest 'equivalent' AutoCAD version. What's nearest to DS v1R2 in terms of capabilities, features and such? ACAD 2007?

 Thanks!