if they didnt impress you you need to perhaps stick to the old sony X series stuff. nothing higher end. Unfortunately with few exceptions it only gets less bassy from Beyer pricing upward, and most of those exceptions are already mentioned here and seemed to not impress you.
I wouldn't say less bassy, just better quality less quantity. But there has to be something that puts out both.
And as for buying, selling...I make site to buy low from authorized reputable sellers. I'm a stickler for looking and hunting for the best possible prices. If in not in love with the phone, someone else might. So I can still sell it lower than the listed msrp, and because I take great care of my equipment, it sells for higher.