Thanks for the response,by chance do you have any model#'s for those router's that are good for DOCSIS 3 so i know what to look for if i go the Ebay route.
If you are going to go the professional Cisco route the 1811 is probably the best bet since the fans are resonably quite. If you have a wiring closet the 3745 is cheaper and faster, but it sounds like a freight train with 6 fans running full speed.
The Cisco route is still $300-400 (1811) $250-$300 (3745) and you really need computer knowledge to know how to program them. The 1811 does have a Cisco Configuration Professional gui front end and the 3745 has SDM (an older GUI), but even so getting a used router to the point where you can use the gui takes work. You have to go in on the serial console line and follow instructions (from cisco) on how to reset back to factory, then you have to hand configure (command line interface) an interface to talk (i.e. give it an IP address) then start up the SSH/HTTP/HTTPS services just to talk to the GUI you run on your computer.
If you have access to all the stuff from work (i.e. the ability to download CPP and SDM), otherwise I do not know where to get them if they are not included with the used router.
The professional Cisco routers are not oriented towards consumers at all. They assume you have someone that is CCNA certified setting it up for your business. I like to program, and it has been a fun adventure, and I can program them pretty easy right now. I have 9 of them now in use at home and in my businesses.
Just be careful not to overpay, you can get new 1811 for $750 and if you get the service contract you get support and software upgrades. The way Cisco works is you buy the router and buy a smartnet contract. You get phone support and repair for the contract (1 or 3 year). If you do not buy the contract you do not get any support, just a limited mail in repair warranty.
http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf - comparison chart, note it is the maximum 64 byte packets that can be routed through. 1492 byte packets will of course be much higher numbers.
If you want to pay the big bucks and go new the 891 or the 2901 are good bets for a business budget.
I use a 3745 for the house, but I have it in a basement closet where the noise is contained. With shipping it was $261 from ebay delivered.