What would be a good router for an office of around 40 heavy utilization computers [closed]

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http://serverfault.com – Our needs: 20~25 wired computers 20~25 wireless computers ~25 smartphones ~500 GB download/month ~300 GB upload/month Various needs: Google Apps SSH Skype Dropbox Sending and receiving >5GB files Syncing thousands of files over FTP ATM, we have Dlink DIR-655 acting as the gateway Linksys WRT54 acting as a router and a wifi AP Unfortunately, it seems like the network is currently on its knees. Everything is slow and we need to restart the router a couple time per day. We tried flashing the routers, switching them around and doing the updates, they just can’t support the load. Ideal (HowTos)