Not bashing your setup, but you know how much good MAC filtering does? Not much, since most WiFi cards are reconfigurable to clone any device on the net. Assuming you're running WPA anyway, anyone with the inclination to crack it can most definitely get around your mac block.

I didn't see any mention of encryption in your post, but if you're not using WPA, you're pretty much wide open, and if you are, you're decently setup. (WPA2, of course, is better still.) (But don't use a weak key!)