True, it ain't cheap but its Asus' highest rated 2-band router with a 64 bit high spec Broadcom CPU and wifi radios. If that is out of your price range then consider the Asus Blue cave router @£124.99 from Amazon, usual price is around £190. Though the price of £124.99 is for Prime Members only (take out a free AP trial to get around this)
If the Blue Cave is still out of your reach then consider something like the RT-AC66U or TP Link Archer C7, both of which are less than £100. But like with most things in life, you get what you pay for
Just seen a TP-Link ARCHER D7 1750 Mbps 10/100/1000 Wireless AC Router
is that better then c7?
Its going for 40 quid or best offer.
Asus RT-AC66u
56.00
Which ones more powerful.
Go for the Archer D7, its newer so will have better wifi radios. It also has a ADSL2+ modem built in but it can be used in router only mode as it has a WAN port. Have a gander here where you can see the router settings in 'emulator' mode: