Some Seneca's are downrated to 1995kg which makes them more appealing
I know close to nothing about twins (though amazingly I did land one today, mind you that one did have both engines running) but the above can make a vast difference to operating costs if one is to use it for serious European touring.
I would recommend looking up the IFR route charges. About £200 on a decent leg across Europe. That is going to be about half the cost of the avgas!
Somebody thinking they are going to fly a de-iced plane (SE or ME) under "official VFR" (i.e. in IMC if necessary) in N European weather, is in for a suprise. A decent operating ceiling is a must, i.e. FL160+, for airways flight.