How are you finding the 307? I have a pair I use for listening while I fall asleep (so I don't need to worry about what happens to them - I don't do this with 007 or 009), and I find they are hard to beat for the price (haven't heard any old Lambdas though) - good bass, very good mids, and highs are quite good too, though I listen at low volume. Seriously underrated pair of headphones.