I just got an Airport Extreme Base Station today. I bought a wireless N one used off eBay, and I must say that I love it! Setting it up wirelessly via my Macbook was a breeze, and it seems to play nice in bridge mode connected to my Linksys Vonage router. Best part: my internet is WAAAAAYY faster than it was when I was connecting through my old DLink wireless access point.
Later tonight or tomorrow I will try connecting my USB HD to it. Hopefully it will go smoothly.
So if anyone out there is looking for a new wireless base station, don't hesitate to pick up the Airport extreme. It's well worth it!