I tend to listen to indie rock and acoustic-y singer/songwriter music. The occasional jazz. In addition to the 650s, I also have a set of Grado 125s and an AKG 240 Studio. I have also owned etymotic 6p which I used to love (but lost). Prior to the 650s, I had tried out the AKG 702, but found them to be a little cold (although I did not have a proper amp at the time -- I have since gotten the Little Dot MK IV).
I really love the 650s, although might prefer just a touch more treble (I am going to try tube rolling soon).
The closed back cans will be basically a backup for late night listening, maybe subway travel and home recording if I ever get back to that.
The Fischer/Brainwavz (which I'm guessing are basically the same) seem interesting, but I can't find where to buy them in the US?
The KRKs look interesting as well.
Do these take to amping?