well since you have already decided but the onboard sound usually is fine, but I believe there are some possible issues so your milege may vary. But with the 155 its moot. Im not sure about that specific headset but the people I know that use the plantronics dsp rave about it acting as its own card. I have the 150 and its got excellent sound, is comfy and has a great mic. I heard that vent used more client resources, but Ive never really used it since my guild uses TS. We have it running on a high end server with a very fat pipe so it might work better for us.