Hardware :: Using AE Or AEBS As Bridge?

Hi. Looking for some advice on whether to purchase an Airport Express or an AEBS for bridging Wireless-N in my apartment.

Currently I run a Mac Pro via gigabit ethernet to a D-Link DGL-4300 wireless-G router. My Powerbook is wireless-G and connects wirelessly. I also have an ipod Touch which is obviously G. I just recently purchased an AppleTV to get some HD and iTunes streaming in the bedroom, so the AppleTV is not located near the D-Link where I could connect it via ethernet.

So I need Wireless-N in order to stream content to the AppleTV. I also need to maintain a wireless-G network for both the Powerbook and the iPod Touch.

I was considering buying a new router that did simultaneous G and N but it would be an awful waste of what's otherwise a great existing G router.

So my question is, should I get an Airport Express and run it in Bridge mode to provide wireless-N connectivity to the AppleTV and any other follow-on N products I may purchase, or should I go with the AEBS which would come with a USB port for an external hard drive?