I'd say that you should go with the Audio Technica A700's or the Sennheiser HD555's paired with a Zalman mic clip (depending on if you want isolation or not).
You can get the headphones for ~$90.00 shipped if you buy used online (cheaper in some cases), and the mic over here:
NCIX.com - Buy Zalman ZM-MIC 1 Microphone - ZM-MIC1 In Canada.