If you wanted to save money in not having to buy a modem/router combination, you could always attach a new router to the existing modem/router combination. Shut off the troubled wireless on the old one and make the new wireless active.
I did this a while back when I found a good deal on a wireless access point and didnt need to replace my router which was wired only. I just plugged a patch cable between say port 3 on the wired router and the internet port of the access point and everything ran fine once the security wifi settings were configured for WEP at the time on Wireless B.
Since then, I have placed routers in series as a double hardware firewall and to distance my home systems from systems that have port forwards that if compromised could give someone access to my LAN, by having 2 routers in series with the first having port forwards etc for hosting servers etc allowing access from elsewhere, and my private home systems under max security with no port forwards and different router brand/make/model, and admin password. So that the worst that could happen if there was a zero day exploit that hit a server of mine if that they make it into the first LAN, but not to the private LAN that is 2nd in series away from the internet.
*This adds a small amount of latency, but other than looking at ping ms differences between systems on LAN1 closest to the web and LAN2 which is furthest from the web, the small latency is otherwise not noticable to users on LAN2.
