I wanna get my mom a used computer. I was thinking a mac mini. Used. She really doesn't do much the requires a ton of hardware. so basically she needs a Facebook machine, and hopefully possibly an upgradeable HD cause she loves her pictures / into photography. So I'll need to get her a 500gb or 1tb HDD later on. So is it possibly to get a Mac for under 300. and if so, what gen should i be looking at?