I want to know more...

I presently use a Dlink DI-624 wireless router to feed 2 iMacs (one through ethernet and the other wirelessly) and a Airport express to stream music to my stereo. I often have to reboot my actual router because it freezes (or crash, I don't really know) about once a week.

I do not know a lot about routers and I was wondering what benefits I would get upgrading my router to a Airport Extreme. I figure that since it costs more than the double of other routers, there must be something better than the others... I know I would gain "N" support, but my iMac 17" cannot work with "N". I also heard that the Airport Extreme is easier to configure, but is it the only benefit I would have?

I would really appreciate getting advices on this matter...