Thanks for your recommendations. So far I didn't consider the minor upgrade to XE2.
This would mean that I don't need a new C1, as XE2 RAWs are already supported. And with respect to size I would stay in "known waters". However, what I hear about the Xpro2 is really nice. I wouldn't expect to get money for my XE1 - was used a lot for traveling to the desert, cycling tours etc...