Headphones with a separate mic or just a gaming headset?

if you go separate, a clip on mic or a cheap usb mic does the job. just keep the usb one close to your mouth, they pick up the keyboard a lot if it sits on the desk.

Separate, if your budget can stretch. Same money buys better headphones than the headset version, and when one half dies you only replace that half. Headset wins if you move around or play on console a lot, one cable is just easier.