When I started EMT school I purchased a Puretone Clinical Lite. It's light as all hell (4oz) and is terrific in the hospital. I never miss a single BP. Working in the field is a whole other story. The ear pieces don't have enough pressure in them, causing the left earpiece to not seal when taking a BP from the CPR seat. The tubing conducts so much noise that I can't auscultate a BP while the truck is running.
Since I started paramedic school I purchased a Littmann Cardiology III. Haven't gotten to use it in the field yet, but I'm hoping for good results. There isn't a single medic on any of the four platoons here that uses anything but a Littmann. We have some terrific medics here, and they all use either a Classic II, Master Classic, Cardiology III, or Master Cardiology. I chose the C3 because frankly, peds patients scare the crap out of me already, the ears in our peds bags cost about $10, and I like having the dedicated peds head.
Also, I'm not the type of person that looses things. I've had the same pair of Oakley sunglasses for ten years. If I was forgetful, I'd tend to go with a Classic II.