Wireless Headset with Microphone?

I'm looking for a wireless headset WITH a microphone to be plugged into my PC (not a cordless phone) that'll reach further than 25 feet, I'm thinking at least 150 feet or so... Does anyone know of such a thing? I use www.dialpad.com for free Long Distance all the time, but it's a pain to be tethered to the computer... forgive me, but cordless phones spoiled me! ANYTHING that you could point me to to help out would be appreciated! thanx