Buying a new router

I need a new modem router for my home as the current one is struggling. It needs to be able to handle ten users on average but up to twenty at least on some occasions. I have an Adsl2+ connection because Australia Woo!

can you guys suggest anything that would be able to handle that?

our internet users usually do the normal things like game and Skype. stream movies and download stuff.

our current one is struggling and keeps crashing so we really need a new one!!

Do you have a budget, and does it have to be a modem+router combo? ASUS and Linksys make some good standalone routers but you need a separate modem.