Which ISP are you with? and I'm guessing you mean modem router, not router.
You need to check you can just change the routers as some ISPs lock their routers so you have to use theirs, not buy one after market.
If you want a solid connection, and high security, the Belkin ones are good - but their firewalls are a little too restrictive for certain things like gaming, and so dont work too well with online games.
Other than that, Netgear are always a good choice, and with their new systems bragging 600mbps, they definitely seem a good choice. Just make sure you have the adapters to fully benefit from that