You can find lots of information on cisco routers on the main cisco website. First of all you don't give enough information to recommend a certain model and second I think that you can look at the specifications on your own and pick a suitable one.
Are you having any wan connectivity too ? You could just run your network with a Cisco 1700. (like a 1720). You have two slots where you can have either additional ethernet ports or wan ports. The unit comes built in with a fast ethernet port. You can either configure the router to route between vlans or you could configure one primary subnet and 5 secondary subnets, to route between the different subnets.
To do vlans, you will need either a cisco switch or a diff vendor capable of doing vlans. A trunk needs to be established between the switch and the router. If you use cisco switch, you can enable ISL trunking or if its a different vendor switch, you can use 802.1q trunking.
You could even get away with a 3550 switch (layer 3 switch) if you just want to route between the subnets and want no wan connectivity.
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