Ad Management - Google DFP and OpenX

I currently use OpenX but am starting to feel it’s a drain on my server. I have to think there’s a better way to do ad management. I’m finding Google DFP very confusing off the bat. Is there another alternative that’s at least decent?

You can use the hosted version of OpenX if you like the interface but don’t want to use up server resources.
http://www.openx.org/publishers/community-ad-server

My main issue with OpenX is how complicated weighting is. Per campaign, per banner. I just want to be able to look at a zone and run banner 1 30% of the time and banner 2 70% of the time without adjusting that banner anywhere else.