What's the best WordPress alternative?

I mentioned on the last podcast episode that McGST is running out of space. As it stands I either have to (manually) remove a lot of old media or stop adding many posts in the future to stay within the current plan limit.

Squarespace is cheaper for the amount of space I need, but close to impossible to build an existing blog upon. The templates are too simple, too static and the amount of tools included are limited at best.

Ideally I want a hosted CMS that requires little time to manage, is reliable and which could deal with a huge WordPress import.

If you have any ideas please let me know. Thanks