I've never done Paris Goofy. Now if it was around Eurodisney..........lol 
From what I have heard great course, loads of runners, crap crowds, terrible finish up some side street near the Eiffel tower. Its never been one that has jumped off the page as a must run event and Paris never really strikes me as a very single blokey holiday destination.......but then again neither in Disneyworld or Rome 
I have done Rotterdam which was my 1st foreign marathon in the race that never was. If you are looking for some springtime sunshine I'd go there. It was 37 feckin degrees by the time the organisers ran out of ambulances and stopped the race with me having 2k to go and we were all told to stop and walk in. I know Rotterdam is maybe not the nicest place on the planet although it was better than I was expecting it is a great weekend. The whole city catches marathon fever, throws all the museums open for free, doesn't ramp the hotel prices up really gets behind the race and makes the visitors to the city really welcome. If the family commitments mean what week can I sneak off without the family it is well worth a look. I had a couple of days in Rotterdam and a couple in Amsterdam (I actually preferred Rotterdam it didn't seem quite as sleazy drugs and hookers isn't really my thing) and had a great wee trip. A marathon, a bit of culture, lots of sightseeing, heineken brewery and a couple of footie games including the dutch cup semi-final at the amsterdam arena. It doesn't get much better than that
I also did Dusseldorf last year which probably seems an unusual one but it was the only one that appealed at the time I could have a holiday. Not as big a race as Rotterdam but a really fast course if it is not hot.; Unfortunately it was later in the year than usual due to the eurovision song contest rather bizarrely. I know Rotterdam has a reputation for being fast but you can get really bogged down in the crowds unless you are Kenyan and starting at the front. If you are chasing a time Dusseldorf is well worth a look.
I always fancied Hamburg and Vienna too but not ever got round to either yet.
I'll see you on the start line in London and Orlando Nykie 