Advice on first home router(possible modem?)

So the hub provided by my ISP is really old and bottlenecky at this point, they would charge as much to replace it as to buy my own so I figure better to own my own hardware than get some bare minnimum functionality piece of branded plastic right?

I'm in the UK so my connection setup is a single ethernet port in the wall with a splitter to connect the phone and talk talk hub via LAN cable.

A quick google tells me Asus is a good brand but I'm not sure if I just need a router or if I need to get a combi router/modem.