Simon, I have a set of Logitech headphones I bought for $20 at Big W.
They have changeable colours on the sides too.
They've worked great so far.
Ebay is your friend on this one.
I got a pair of sennheiser HD 590s for 40 bucks, originally close to 400 for the pair.
they are the best i have ever worn, and i do just use a stand alone mic.
Normally, headphones with mics attached are gimmicky, the company is uninterested in quality. you might find one or two good brands out of the many.
i definitely would go the quality route with sennheiser or grado.
here is a link for sennheiser's pro gaming headphones.
Get the model number and go ebay diving.
"you must be the change you wish to see in the world"
-ghandi