Great advice! The only thing I'd add is what I tend to tell anyone who comes to me for advice on cameras is that your almost always better off buying a generation or two back from the current generation DSLR or mirrorless camera and putting that savings towards getting higher quality lenses and as a bonus lenses hold their value better than the camera bodies. If I didn't need my DSLR for the photobooth software I use I'd have sold it by now as the micro 4/3 system is a near perfect fit for my modest needs.
RE: Which camera should I get??? Why cameras cost so much!