Akismet or TypePad best with WPMU?

I found some old discussions on TypePad being a good option for WPMU because it allows you to protect all of the blogs with no fee. Is still the best option or is Akismet better and worth paying for? We are not sure that we’ll make money off of the blogs so I would rather not get into a situation. I thought I read here sometime ago that you can put Akismet into WPMU and let each blogger get their own key. Is this so?