Since my musical tastes are 60% orchestrals/ classical, 25% Rock, 10% Hip-hop, and 5% oldies, and my budget is anywhere around $300- $400, I'd probably be stuck between semi-closed or sealed back cans because I'll be powering them with my cellphone (samsung galaxy s3). I'll be purchasing an amp down the road but not at the moment. The music formats are mostly 320kbps mp3 and flac. As for soudn signature, I'm just looking for non-fatiguing highs and luscious mids, maybe a splash of bass but nothing overwhelming.
The V-Moda M-100 is a good can for a basshead lite. It is not so good for orchestral/classical music.
Are you OK with open cans (they leak sound)?
What equipment will be powering these cans? Will you be using an amp?
What is the format of your music and other sounds you will putting into these cans?
Describe the sound signature that you are seeking?
Do you plan to use them outside your home? If so, in what way & with what equipment?
Until you get an amp, look to the Audio Technica ATH-ES10, Beyer DT 1350 or Senn Amperior.