I am wanting to setup a WPMU and sell to people the ability

I am wanting to setup a WPMU and sell to people the ability to setup their own blog on my network.

I know this is what Pro Sites is for and I've started playing around with it some.

I'm wondering though, what are popular plugins and themes to offer to customers at the various levels?

I'm thinking of a simple 3 level system. I just am hoping someone is willing to share what kind of plugins and themes from WPMU DEV they offer at the various levels they use?

Thanks.