How hard would it be to do the Rastapants mod to some T50rp's? It looks and sounds promising I'm a college kid with no experience taking apart headphones. I know the basic layout but I don't want to ruin them.
Amazon also has 250ohm DT990s used for around $190. I've read great things about them and they also sound promising.
With either headphone I'd save and buy an amp. Most likely a desktop amp in the $100-150 range.
*btw lots of people seem to think the e6 doesn't make a difference on the M50s but after burn in time I heard huge differences in the mids!