This may be a bit late, but don't overlook the AKG K501 or K601 if you can find a deal on them. I bought a new pair of closeout K501s on eBay for $120--they're outstanding and non-fatiguing, though the bass, tuneful as it is, doesn't go super deep. The K601, though I haven't heard it, is supposed to have great bass but ever-so-slightly rolled-off highs--might be just what you're looking for, and a lot cheaper than the K701. I'm aiming to buy a pair soon. Grados have too much treble emphasis for comfortable listening, to my taste. You can't go wrong with the Sennheisers, either, if you find a good used pair.
