Your question is: What type of computer to get???
And you Poll only consist OS(operating Systems)
If you question is the type computer I would say go for Costum (if you are good in wiring and computers in general)
If you question is OS, Windows 7 for a pc.
Mac: You pay too much boy
Linux: Only if you do only the most basic things on a pc else you will be busy figuring a lot out with settings.