For those who shared my problem with MAC address filtering in a thread on this board I'm glad to repoort that it works great and all of the firmware is much quicker, better, etc. on hardware version C. Tech support confirmed that hardware version A of this product would not MAC address filter but they sent me version C that will.
Since I was setting up a new router I went with some suggestions that a wireless network security article that Swimmer linked to made and:
1 Stopped broadcasting my SSID
2 Used WPA-PSK encryption
3 Set a MAC address filter
and it all worked great with my $20 DLink router. Thanks.