No, VPN is way too slow. It's directly via web browser over SSL.
It's probably not fair, hence the sushi reference. Hard to know what it is until you try it, then you love it.
Or hate it.
Sounds like you aren't going to use SBS, which is fine.
We use RDC, LMI and RWW to get into the full computer, use AC and other apps.
I remember seven years ago and IT friend of mine telling me after Microsoft Back Office went of date that I needed two things. SBS 2003 at the time and SharePoint. Try as he might, he couldn't explain it. You just can't explain how helpful SharePoint is until you use it.
If you ever change and go to SBS or you can add it to Standard 2008 versions, feel free to let me remote in and show you it in action.
Good luck with your setup. I guess if you go that route, you can always upgrade to a server and still use that computer.
My only caveat would be to not use that computer as anything other than a main computer.
Keep in mind my rules of three when it comes to advice on a network or computers:
1. The person will always try to get you t buy what they like, hence SBS for me, different for dog.
2. Above is not a bad thing if THEY are the ones helping to maintain it, because I would be lost in Dog's system, but know SBS backwards and forwards.
3. People love spending other people's money on things they would love to have. Kind of living through you.
PS You probably won't need this without a full network domain, but if you ever have issues with the network, it is always DNS, DNS, DNS and then anything else. But after you try something else to fix it, go back to DNS.

Won't make sense to you now, but it will if you go server/client. In fact, I would get a book on DNS, lol.