I decided to go with the Linksys WRT110 . I found it for about $45 and it claims "Entry-Level N" which I've discovered is not really N, but stronger than G. I figured what the heck.

Set it up in 10 minutes, got the MacBook surfing and it seems to be working fine.

I just wanted to make sure I have all the security measures set up properly.

I enabled MAC filtering to allow only the MAC address of the wireless computer.
WPA-2 Enabled.
NAT enabled.
SPI enabled.
Changed the default SSID.
Changed the default P/W.

Is there anything I'm missing here?
Thanks for any advice.

Paul