I bought a Time Capsule, but I'm finding that it is not a replacement for my Dlink wireless AP.

I worked around the lack of IP Spoofing by spoofing the TC's address on my MBP long enough to get the cable modem reconfigured to match the TC.

The thing I can't get around is the lack of DynDNS.

This works like a champ on the Dlink and they provide the support.