I always recommend this router....and i know people are probably tired of hearing about it on this forum

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D-Link DGL 4300 Gaming router. Exceptional range (better than N from what I've seen). 108 mbps transfer rate, if your using D-Link adapters in your computers. The D-Link WDA-2320 range booster G desktop adapter will give you 108 mbps transfer rate with this router. It has GameFuel Priority technology, which is basically this routers version of QoS (Quality of Service). It gives priority to programs which require more bandwidth. For example, it will give priority to the gamer rather than the IM'er or the downloader.
Personally, I think it'd be pretty good for your situation. It prioritizes internet traffic so that you wouldn't have users using up all the bandwidth for one app, then having other user get none of the bandwidth for their app...... I'm saying it'd help to spread out the bandwidth consumption equally.
It does cost a pretty penny though, over 100$ at the moment. You can get it for 100 at Fry's. Cheapest price I've seen for it. It did cost a lot, but it was worth every little bit.
There are also many other routers out there, but I always recommend this one because it doesn't randomly restart, it doesn't choose when IT wants to work, it is dependent, and it does everything it says it can do, and it has a couple of extra features that make life easier for the novice user, and advanced user alike.
Borgslayer