Hi,

I always suggest the D-link DGL-4300 gaming router to everyone looking for speed, reliability, and coverage. It's a little on the expensive side, but its definitely worth every penny . It says its also Mac compatible .

There is one USB adapter that might work with your Mac:::

Hawking Technology - Wireless-G USB 2.0 Network Adapter - HWUG1A

It also has a detachable antenna on it, so if your getting weak signal on your computer, you can just upgrade the antenna to something stronger, which i think may come in handy.

Are you going to be connecting your Dell to the router via a Ethernet wire, or just wireless?

Borgslayer