if possible try reading through http://www.head-fi.org/t/534479/mad-lust-envys-headphone-gaming-guide-updated-11-12-12-sennheiser-hd650-added for comparisons/reviews on both the Q701 and 598s (and MANY, MANY others.
Regarding amping the Q701s, http://www.head-fi.org/t/582276/q701-appreciation-thread.
Personally I'm using a Matrix M-Stage after the mixamp with great results.
A search next time will yield instant gratification, these are an often talked about headphones...
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