I've just about had it with how garbage my mixes are; after (finally) getting serious about mixing and trying to learn mastering, I've realized that my headphones (Sennheiser HD202s) are the main limiting factor (other than my ears, but I've just about given up on that).
I'm looking at these headphones as they seem to be excellent for critical listening, but I've read that I'll probably need an amp as well. I can spare $200 but $480 is too much.
So, do I really need the amp? I'm at the point where my low-mid-heavy cans are simply not doing it anymore and I want something that I can use forever; is it worth taking the plunge?