problem with maya is.. don't know if they changed their policy, that you can only upgrade from 7 to 8. From 8.5 to 2008. You cannot upgrade you maya 5 license to 2008... so you have to upgrade if you are in a production-like environment. as for a single user I'd stay with the version till something that seems to have the worth to you to upgrade. but then its again plenty o money. hope i'm wrong with the stated above...