iBot said:
300m Excel 4pair UTP cat5e
It's what I use. Whole house is kitted out and still got a LOT of cable left over.
Your mates will be asking to wire up their houses before you know it!!
Not actually been able to test it yet cause the house is still being refurbed. Should be finished next week though. Yay!
Edit - if you're wiring into wall cavities etc, pick red (like me) or blue or sommat instead of plain white. Makes it MUCH easier to tell it apart from white phone cabling when you're setting it all out. Or even use it for the phone cabling too! Just make sure you buy labels to tell what goes where!