Like others have already said, it looks like your Belkin router already does what you say it needs to. Don't throw money at a problem that doesn't exist. I had a cheap D-Link router that served my needs for years.
If, in the future, you want to do lots of online gaming where milliseconds count, you want to increase your signal range to get to those hard-to-reach places in your home **or** you want to set up a no-fuss

tv configuration, then and only then would I recommend a router upgrade. For gaming or range increase, any "high end" router will probably do. For the

tv, the Airport Extreme Base Station is the most powerful choice; it and the Airport Express have the ability to wake a computer running iTunes from sleep, make it send a requested media file to the

tv, and put it back to sleep.
If you ever do upgrade your router, keep your original router if possible. It can often serve as a wireless network bridge; many people use older routers to connect Ethernet-only media consoles (such as XBox) to their WiFi network.