So I think most EAs have come to the point where they realise that small trade offs and agonising over them displace other good things, so they try and find a way of setting a limit by year or whatever. But you know many people agonise and make trade offs, its just that often it isn't giving to the poor that's the counterfactual, it's saving or paying the mortgage, or buying a better holiday or school for their children or whatever. If you don't think like that, then you have everything you need?? http://www.givinggladly.com/ and http://www.jefftk.com/index have documented going on this journey of living well with generosity. Sounds like it might be worth a read :)

edit: Soz Ben, I think I put this comment in the wrong place!