If you are planning to lock down the PCs and work out billing etc you will need a server and cyber cafe software like those you linked - though the server can just be another PC in most cases.
I don't really recommend letting your customers install loads of crap so a router only option is probably not such a great idea. You could maybe look at an integrated appliance that did AV and URL filtering but they could still screw your PCs over with just that.
yup.. im planning to control client pc using that server. so, 1st thing i must do, maybe istall deep freeze for client pc.. and then i need to disable CTRL+ALT+DEL button for client pc. so. thats why i need some of advice for setting on server PC. im still blur on VPN, DHCP, DOMAIN. so, dont know which step i must do 1st.