For as cheap as possible I had a pair of 30 dollar plantronics that were alright, pretty damn good for the price but nothing spectacular.
For a stand alone pair of headphones you might try the ATH M30s but they are kind of pricey at 50 bucks.
Clip on mics, I just go with whatevers cheap, the 10 dollar Zalman mic has a pretty good reputation, haven't used it personally though.
Headphones I've tried include quite a few cheap earbuds > $30 plantronics > $50 corsair vengeance 1500v1 (sale) (retail 80-100 bucks) > (warranty after previous set broke) corsair vengeance 1500v2 > ($150 bundled with amp) DT990 pro 250Ohm.
But for 50 bucks I highly highly recommend a pair of corsair vengeance 1500v2s if you can find them on sale thats what you should get, even if you have to run an active USB cable.