Good Stethoscope; Not Too Heavy

I need a high quality stethoscope that does not feel like a cannon ball around my neck. I was introduced to the Kila cardiology scope; the single head version. It is excellent, as far as sound quality, but its really too heaving to have around all day long.
Anyone know of a comparable scope that is lighter? The cost is really not an issue.
I have a littman. Not sure which one exactly and it's at work right now. Most of the nurses and docs I've worked with have a littman. They are really nice and most are not very heavy. I think mine cost $80 something 4 years ago.