Heres a hint...
2003 mx comp is now the cheapest marzocchi fork. The exr no longer exists.

Just like the z5 is no longer around which has been replaced by the exr. There are small differences but in the end it isn't that big a difference between the years.
They are decent and will be durable enough to start with. Mine lasted a season and could last another if I didn't want to take my riding to a new level. It will be good for aggro xc and light freeriding