" I run it through my DD-WRT-based router and make sure that it gets a high QoS level "
You set it VOIP like this.. and for the most part you won't have any quality issues, regardless of how much Downloading you are doing while your on the phone..
http://www.dd-wrt.com/dd-wrtv2/ddwrt.php is the cheapest way to set it up correctly.
I'm still waiting for the government to come out and regulate or screw up VOIP in some other way, cause as far as I'm concearned after paying for regular phone for some many years, this is too good to be true...
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Free Vaporizer