I have had done the calculation that buying a used Nikon 9000 ed isn't financially justifiable as to simply buying a used Howtek 4500. However, I am quite newbie at drum scanner, but don't worry, as I've reviewed the mounting process over youtube, it isn't as hard as I imagined and looked quite simple, simply applying fluid and squeeze it to ensure bubbles coming out, then seal it with some tapes for not letting fluid leaking out, that's it. As a computer science graduate, the software won't be a challenge for me either. The problem is how to choose a used drum scanner: I understand one should carefully inspect the surface of the drum. I have googled for quite a while and noticed several used Howtek 4500 selling for around $3000 with drum mounter and coming with software, looks like bargain to me. Any opinions? I mainly scan my 20 years old 35mm films(lots of them) and a few medium format of my parents', the problem with film scanner is that they ain't costing any cheaper than Howtek drum scanner. Why bother with CCD while you can get a DRUM scanner for same price?