Okay, I realize I'm a noob too... but from one noob to another - you can have some really great cans with excellent sound for the amazing price of $80. The MB Quart QP805HS (300Ω). Mind you I'm not affiliated with this ebay seller AT ALL - just trying to pass on a GREAT deal to a fellow headfi'er:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360381010086&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I bought these based on a recommendation from headfi member Acix - see this thread:
http://www.head-fi.org/t/563535/best-headphone-for-monitoring-bass-guitar-in-live-performances#post_7690531
These are perfect for my intended use - monitoring my bass playing in a band. Mind you, I have an amplified source in the hearback unit. So if you buy these for yourself - you will need an amplifier. As Uncle Erik states earlier in this thread - spend the rest of your money on an old quality stereo amplifier and you will not be disappointed. I have a '79 Yamaha CR-2040 and it has two headphone jacks so you can A/B different headphones. The sound is amazing!
Hope this helps. If you have a total budget of $300, this would be a really solid route.
Thanks,
placeboe