I am a beginning nursing student and we are required to purchase our stethoscopes within the next few weeks. There are so many brands and quality levels. Littman seems to be widely used. I think I want to go ahead and get a nicer one for the sound quality since I will be working with it for several years (if it doesn't walk). I don't want to overspend though...I am a student after all. Any suggestions from you more experienced ones out there?