said by mix:...you must use WPA2 AES encryption or no encryption at all for wireless. Anything else will most likely prevent the ability to supply 50 Mbps+ throughput over wireless.
also enable WMM if the router has the option. you'll need both for 802.11n, either on 2.4 or 5ghz.
if you have the option for 40mhz channels, turn that on too.