Walkstool, very good quality made in Sweden, can be had in different heights and seat sizes I have the comfort 55 one, the most comfortable stool I've ever used
expensive but worth it got mine from WEX.
I use exactly the same, I'm 6'2" and it's perfect for me. Not cheap but built to lastThese are very popular amongst my colleagues..
http://www.safrut.co.il/english-private-collection/english-mini-max/