If you need a wireless modem I suggest you to go for Belkin N1 Wireless Modem Router since it is a popular wireless modem.if you go to Compare modem Broadband Routers Prices - PriceRunner UK you can compare the price and quality of different modems available in the market.
D-Link DIR-655 Wireless N Gigabit Router, 300Mbps, Vista compatible, 10/100/1000Mbps 4-port switch, WAN port, firewall& content filtering, Wireless LAN
It is a good one you can try for.
Why not try the ZyXEL P-660HW router, its a fantastic all-in-one afforable router.Its reasonably priced, had no problems with it and its expected to function for a long period of time. This is a compatible with high speed ADSL.