You shouldn't have any problems with the D-Link DGL-4500. My ISP sent me a D-Link DIR 615 + D-Link DWA-140 USB WLAN adapter for free for testing purposes to test it's wireless capabilities. The D-link was fast and stable on Wireless N so no complaints.

Personally though I would go with a something like the Vigor 2820Vn Series ADSL Router Firewall if I were to replace my Draytek Vigor 2100VG if it failed.

http://www.draytek.co.uk/products/vigor2820.html

Its more expensive than other basic routers but provides wireless 3G connectivity and the possibility to load balance DSL and ADSL connections and even dial-up using POTS if your DSL, ADSL or 3G connection becomes compromised. It even has a USB connection for NAS if not using your 3G USB wireless dongle. It also has VOIP connectivity to allow the addition of 2 virtual telephone lines.