In my opinion, you do not need an MVP to set up SBS Essentials. SBS Standard, probably, but not essentials. There's a video outlining the process in my signature.
I don't think they sell SBS 2008 Premium, at least not through Dell anymore. You would get Server 2008 instead of Server 2008R2. SBS 2011 Essentials and Standard are the choices. It doesn't seem like you're interested in onsite Exchange (email). Also, SBS Standard requires all of your workstations would need to be Win 7/Vista/XP Professional editions as well as CALs for each user/device. It would also require a domain name and SSL certificate to be used effectively. Thus, SBS Essentials seems like the best choice for you.
SBS Essentials is simple, effective, and easy to manage. You can use the premium add-on with Essentials as well. It's just SQL Workgroup and Server 2008R2. Buy the add-on later if you should need it.
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