Paid fast lane
The only argument I can think of in favor of paid preferential treatment of traffic that would benefit the consumer, and not just a provider/vendor, is VoIP traffic. Even then, in most cases companies that need this usually drop their own WAN connections and configure accordingly. The benefit would be to one-off sales offices or work at home employees that can take a company-issued VoIP phone and use it striaght off their internet connection.
Any other ideas?
That being said, I tend to agree with the "against" crowd for all the reasons mentioned - creation of a class system, the economic "rubbing out" of small businesses. artists and other contributors that simply can't afford to pay the premiums to make their content reasonably accessible, anti-competitive moves like the example given: Comcast could throttle Netflix unless Netflix pays them a premium (sorry Comcast, that example is just too easily understood by most), and so on.
Perhaps the FCC should define what services can be charged at a premium, such as VoIP, if they're going to do this at all. Rules like that can be a boost to business productivity and revenue if they're well thought out so that everyone wins and not just a select few.