Been looking for the same range of headphones myself for about a year ago and tried out some different headphones in the 50-100 $ area (or more presise the 300-500 NOK area). It all boiled down to the AKG k-416 and PioneerSE-MJ3 and I own both now, Sennheiser also had some really nice headphones in this area but they didnt fit my head to well and hang a little loose. Anyway, I would say both of them (AKG and Pioneer) is a good choice. The AKG was cheaper and is slighly smaller, more compact and portable, while the Pioneer covers more of your ear better and have more powerful speakers. A drawback for the Pioneers however is that they tend to sit a little loose on the head so you may lose some bass and overall volum, and lose them while running, bowing down etc. I found out a way to prevent this actually was to have them on the "wrong" way (L to right ear and R to left ear), they're still a little loose but it has a better contact with the ear. Ok, this sounded wierd, but try them out first if possible and you will probably understand my point.
Anyway: Both are good and solid, the AKG is cheaper, more practical, and sits better to your ear. Pioneer has a bit clearer sound, more powerful bassrespons and is more like fullcovering headphones. Good luck with you choice!