Hi all, I have had iPhones and iPads for several years now but never owned a Mac computer. I'm doing research on the buying guides here but had a few questions about shopping for a basic used Mac to start out with. First and foremost I want something used and cheap but not so dated that it that won't run current software or will be agonizingly slow. From what I understand you can update the software for free to the lastest version just like iOS on my iPhone/iPad. If this is so why do so many of the used macs I've been looking at on eBay have Yosemite and mountain lion and the older software vs the newest el capitain software? I have been looking at iMacs and MacBook airs but read about graphic card issues in the older MacBook airs and not sure of what year iMac I should be looking at. I'm seeing lots of core duo powered iMacs which seems really really old to me but in my price range..under $400...and a handful of i3 machines ( the older i5 processor iMacs are out of my price range) but just want to do basic task on it. I have a dell i7 quad core with 16gb and SSD i use most of the time so again this is just to toy with. Is there a perticular iMac or MacBook (year and model) that someone can recommend thats a good starter Mac?