Best Windows 2008 service pack?

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Hi /g/, I'm the guy whose computer broke last week, thanks a lot for your help, but they said it can't be fixed. I have a different issue, I'm gonna need a server because my kids need to share a printer, I was looking it up and I found this 180 days free trial of Windows 2008 for servers. I'll definitely be buying it, as I need it permanently, but my issue is that it is asking me to install one out of 6 different service packs, and I don't know what to pick. Could the problem be that I burned it into a direct video disc instead of a computer disk? Or is it that I'm using the virtual trial tool instead of a real computer? The download page said nothing about different service packs, but to be honest I don't care about any of that, I just want it to work.

Setting aside the obvious price difference, I would like to have some free space to make changes in the future, so I guess the full service packs are a no go. Then, which one of the Core service packages is the best for my needs? I don't really want to spend more than 700ish bucks, so if the Standard can do it I'll buy that one. What do you think?

Also advise about what hardware to buy would be appreciated. Would this work on the same computer model that I broke last week? You know the one.