Which Cisco device I could use to limit the Internet Bandwidth at each port? Do I need a layer 3 Cisco Switch?

I have a 256 kbps Internet connection and several users. I want to put an upper limit of bandwidth usage by the users. I want to implement this strategy in my company. Can you tell me the name of the Cisco Switch which can efficiently do this and also allow VLANs and VTP (both dot1q and isl)?