Hmmm, although that sounds like a great value, I've heard Mad Dogs only start to find competition in the 1000$ price range. So although I probably won't end up getting stock Fostex's, I still want to mod! I have a spare pair of sony's I can practice on, and afterwards I'd like to mod my harx700's. Any advice on where I can find guides on recabling with removable cables, repainting cans, etc? I'd like to start small before moving up :P
Well I did say rather easily--Mad Dogs are most likely not simple mods, but require tuning... or at least a formula all figured out.
I never heard anyone else's T50RP mod but for the lack of effort I've put into them lately they are quite nice sounding. I can't even start figuring out what $1000 cans sound like, sadly. Most expensive headphones I've tried are probably the Amperior.
Practice modding if you can; I did that with my JVC HA-M750 also and the results weren't bad. But as wje said, the difficulty in modding the T50RP is the fact that the solder points are pretty fragile (since they're on some printed circuit not-quite-board... film? PCF let's call it for now), and so the baffle and the cup do not separate. While a normal dynamic or even orthodynamic driver with pulled off leads can simply be resoldered on, these are a PITA to fix because the PCF can melt with a soldering iron.
Thus the only thing you should pay attention to is the headphones themselves. The rest is about patience and being able to acquire the materials. Following mods would be a good idea unless you'd like to experiment in unexplored land.