Piwik is astonishingly good. It'll give you trouble if you have a lot of traffic, but for moderate sites it's pretty much a completely self hosted drop in replacement for Google Analytics. You can track conversions, set up campaign goals and view statistics overlays for example. Not all features are available when using the log import backend, as compared to the javascript thingy, but most are and it'll give you an overview on how your ad blocking customers are doing.