Allhearts.com has them on sale for $120 right now, I think. Almost everyone on these boards recommends the Littman Cardio III, especially for students. If you're only going to do internal medicine and will never need the pediatric side, I guess the Master Cardio might be a better choice, though they also recommend the pediatric side of the Cardio III for especially thin patients. Then again, judging from the patients I saw shadowing an internist you'll probably never need that peds side.