Having a mobile broadband 3G USB modem is good enough for one user. But if you need to share with other users, then you'll need a 3G wireless router which is more expensive than a wireless router. D-Link DIR-451 costs $299 whereas Zyxel NBG412W3G costs $229.
Zyxel 3G router is Wi-Fi b/g certified with WPA2 and is compatible with Huawei E169, E170, E220 & E270 USB modems. You can disable remote management, change password, upgrade firmware and it has the important features and good to have features. It comes with 3 years warranty and you can even check your warranty period online.