MacBook Pro :: Wireless Dual Band N Router To Get?

My son and I both have Mac Book Pros and a wireless network running at home. We have Snow Leopard, and Comcast 12mb cable internet. I currently am using a 2 year-old Linksys WRT160N router going through my own Motorola Surf Board SB6120 modem. It's been fine the last couple of months after the switch from AT&T, but every now and then, it seems to lose the IP addresses and connection, so I end up having to call Comcast to reset them from their end. I'm beginning to thing that perhaps it's time to get a new router. What is even stranger is that sometimes I still have service and my son, 20 feet away in his room, loses it or vice-versa. What are your esteemed opinions on this? Do you think it's the router or some setting? If it is the router, what do you all recommend in the way of a dual-band, perhaps dual radio, wireless N-router?