Well, English may not be your mother language, but you write it better than a lot of Americans, so you probably won't get complaints about it.
I understand that you're a Mac fan, but I also see that most of the system will be running under XP. I used to have Macs, and I still like them, but if the apps are all XP, why not just build an XP machine and skip the dual-boot?
Look at something like the PicoITX machine; it's smaller than a Mini. The ARTiGO kit is about $300 + $35 for memory and whatever 2.5-inch hard drive you install, so call it $425 (in the U.S. -- I don't know about availability in Brazil).
The support base for XP is far larger, and you don't need to worry about dual compatibility.
I'm definitely not slamming Macs, but I wouldn't choose a more difficult route if the only benefit is to have an Apple sticker, so I'm wondering: what Mac-only things do you plan to do with it? Is availability in Brazil a major consideration?