I've got a pair of beyerdynamic st770 pro phones
http://www.theheadphonecompany.co.uk...es-250-ohm.php
They are in my opinion superb headphones. Really comfy. I use them for my e drums and also for monitoring when recording in my studio. Whilst not cheap, they are certainly not the most expensive and you do get what you pay for! These ones are high impedance at 250 ohm and wouldn't be very good with an ipod. They do much lower impedance versions though.
The beauty of these over ear/ closed back phones is that you can actually try them out beforehand unlike in ear buds. I'd recommend going to a decent hifi or pro music shop and try several out to find out what suits you best. It's such a personal, subjective thing sound. What I think sounds great, you might think sounds like a bag of sh!te.
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