Take this post to your dad and make this case:
Borrow dad's credit card. Do your research and find a good online vendor or two that sells Sennheiser, AKG, Beyer and Denon at good prices with a no-questions-asked money-back trial period. Order the following:
Sennheiser HD600s -- I think you need to give these a second listen. They fit what you're looking for to a T and will only get better when you get an amp.
Sennheiser HD595s -- The Senn sound with a little more forward presentation. No amp needed (though they will get better with one)
Dennon D2000 -- Maybe a bit big in the bass for you, but worth a listen. Work well without an amp.
AKG k601 -- May be constricted without an amp. Depends on the strength of your source. They will definitely improve with amping down the road. Great mids. Great controlled bass. Slightly rolled-off highs.
Beyer 770s -- There are two versions. The Pro seems to get the respect around here, but they will also be harder to drive without an amp. But in general, the "need" for an amp is overstated. A good strong source will drive any of these phones. They may not have the taughtness and control (mostly heard in the bass) that they will with an amp, but they'll sound better than Bose, and any improvements an amp will bring gives you something to look forward to.
Treat them gently. Pack all the packaging and receipts away carefully. Listen a lot in your trial period. Send the losers back.
By the way, I haven't heard all of these phones myself, but in a couple of months of hanging out here, reading posts, this is the stuff that seems to have risen to the top. Let me know how it works out!
Tim