I'm gonna throw a little off-the-wall-ness in here and say consider getting the $40+/- JVC HA-RX700 and perform the open-back mod on them (http://www.head-fi.org/t/369863/jvc-harx700-a-poor-mans-ath-a900/150#post_8910438).
And for $50+/-, I can't recommend an 18V 4556 op amp cmoy any higher. It's my best friend. I have yet to find a headphone it isn't utter magic with.
Good plan, but Mods can be scary for first time buyers! Who don't have extra money to replace thier broken un modded headphones >.>
Also there is the Byerdyanmic COP, that has "adjustable Bass" for around $140 or so and you can choose if you want a BASS head can or a nice Byer can with modest Bass. A good value imo
Edited by Mshenay - 12/3/12 at 5:32am