I posted a similar question in another area of avs and got some great advice. Copy and paste here:
Originally Posted by jerndl
Try using a wireless router that can easily be switched to access point mode like this Buffalo WHR-HP-GN. For some reason they are usually less expensive than a dedicated access point and provide a builtin 5 port switch which most dedicated APs do not. I have used this particular unit as an AP (and a wireless bridge) recently and it did a good job of providing better wireless coverage. For your use it should be pretty simple to setup by just moving the switch on the side to AP mode. For $40 you get your 5 port switch AND a wireless N access point. The switch is only 10/100 but that should not matter for your application. Good luck.
FYI, I bought this router and had it running in less than 5 minutes. I know have a G network, N network, and wired Internet for my main devices. Very pleased with my purchase.