Extending CAT5 Recommendation

Can someone recommend a hub, router, switch, repeater for extending CAT5 wiring beyond the set limit (I forget what it is)? I have a small LAN with Broadband Internet access. When trying to run a CAT5 wire to the next building it exceeds the distance limit. Basically I am trying to setup a LAN in another building and have it connect to the existing LAN (for Internet and connecting to other computers). Sorry I am not a networking expert so if you need additional information please let me know. No server, only Windows XP machines.