Joe, I'd skip the pass, and think of a combo of air and train (and maybe car). Air from Dublin to London is much faster and incredibly cheap these days, I'd advice that, unless you want to see the country side.
From London to Paris air is also a good option, but the chunnel is a unique experience in and of itself.
Paris, Amsterdam, Berlin, very easy to do by train. Here's where I'd use the car (personally) That area between Berlin and Munich is beautiful, and has some great drives.
I'd train again from there. :)
I've always found the passes to be more expensive, even without all the extra fees that they do charge for high speed, England etc. Hope that helps!