Thanks. I probably won't try out the DT-880 250 ohm. I just don't want to be too quick to judge the 250 or 600 ohm versions when I only had the 32 ohm version. I did order the Beyer DT-990 32 ohm with next day delivery. I hope to try them out tomorrow. I'm not sure why I did this and deep down I kept hearing "don't do it stupid!". Not because they might sound bad, but because I just bought the M50's yesterday. If the Shure 840 had the bass and comfort of the M50's, i'd be all set for a closed type of headphone that's portable. I like the sound out of the 840 a bit better, but not by much. The somewhat fatiguing highs on the 840 are the biggest negative. If I had a decent EQ on my portable device I could fix that. The Ipod Touch's EQ is worthless due to Apple dumbing down everything to keep it "simple". I have a Sansa View, but even with my portable amp, the sound is a bit too low.
Today I was sitting here listening to the M50's for about two hours. I then took off the M50s and went to the HD-600. Night and day difference for me. But for $100 headphones I can't complain. Only when I compare them side by side to the HD-600 can I find out their weaknesses. It's hard to spot them. The sound is a lot less clear then the HD-600. So far I haven't had a day where the sound of the HD-600's didn't impress me. I think i'd like a second pair, something with a ton of detail (more so then the 600) but that doesn't hurt my ears and just not excessive detail. If the AKG 702 was a tad more accurate and had a better fit I would have kept those.
Tomorrow for the DT-990's i'm expecting a lot of bass and no recessed midrange. I just hope the highs don't annoy me, but my expectations are going to be low. I actually had them about a year ago and sold them due to needing the money and already having the AKG 701 back then. They lost to the AKG 701, but I had totally forgotten I had the 32 ohm version. Doh! I don't know how I could have forgotten that. Strangely I never remembered thinking they had a lot of bass or them being too bright. I hope I remembered right.