There are a couple of home and small office routers that offer integrated gigabit but they tend to be overly expensive in my opinion.  How many computers do you need to wire up?  Your best bet is to buy a gigabit capable switch (likely either 5 or 8 ports depending on how many machines you have).  If you search a bit and wait for a sale, you'll see that 5 port gigabit switches (even one that supports jumbo frames which you probably won't need), routinely go for a little over $20 after rebate.

 

You would connect one port on the switch (it may be labeled as an uplink port) to one of the LAN ports on your current wireless router.  You would then wire your computers directly into the switch (instead of into LAN ports on the router as they likely currently are).

 

The plus side to doing this (aside from being cheaper), is that you don't have to reconfigure all your current router settings.  Wireless settings, firewall rules, and the like will all be maintained as you're keeping your router in place.  Additionally, you'll find that the local network will stay up and still work even when you have to reset your wireless router (switches are much more stable).

 

Feel free to post back with any questions