Maybe searching those router supported by DD-WRT?
DD-WRT support client bandwidth allocation.

You can view the demo here
http://www.dd-wrt.com/demo/

this is the qos page
http://www.dd-wrt.com/demo/QoS.asp


(note, not all router that support DD-WRT actually support QOS, see the supported device list
http://www.dd-wrt.com/wiki/index.php/Supported_Devices

and the build features
http://www.dd-wrt.com/wiki/index.php/What_...#Build_Features


edit: after checking the features, it seems all build support QoS.

This post has been edited by steakikan: Jun 13 2012, 09:58 AM