First I want to switch to 50mm lens, whereby the x100 series is 23, but 35 equivalent. There is the Telephoto conversion lens and I've read good things about it.
What I'm looking for in a camera is being lightweight, small, having access to the shutter/aperture on the body rather than menus. I first got into photography November('15) got the Nikon D3300, then the following spring took a photography class which was film based, and during that semester I sold my d3300 for the x100s. What I like about the x100s is that I do majority of my shooting with the OVF/EVF.
Also might just go the film route, I still have the Nikon 2020 I used during that class and looking into an rangefinder 35mm or slr.