So coming back to the original point I was making: unless you need an advantage from server - like accessing multiple computers from a second location - stay with Peer to Peer network, irrespective of what Bert's IT guy says. You are not managing 50 or 100 desktops - where I can see the advantage of centralized management.
That is one of the many advantages of SBS 2011. Active Directory and group policy has to be the biggest feature of a server OS. I can install a printer on all of my computers at once or a piece of software (like AC or Microsoft Word) to 10 computers easily. Hell, I can even install a custom version of Windows 7 preloaded with everything I need on all of my computers in minutes.
You have 8 computers. I'd imagine installing all the applications, drivers, AC, etc. that you need took a long time. This is where a server comes in handy.
Security is another big one. Throwing everyone in the security permissions for P2P is a very dangerous thing to do. Anyone who's on your network can delete your AC folder or take a copy home. Active Directory requires you to authenticate against the server and you can control permissions more easily.
This is a very brief mention of just Active Directory, there are numerous others like RWW or HTTPS authentication, on-site email, etc.
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