The key is not to upgrade and you shouldn't if it's a production machine regardless. Windows 10 runs well as a dual boot, and reaches the login screen in 3-4 seconds via SSD. Sierra takes 12 seconds. Upgrades simply slows down your machine/ devices over time. I remember when I first got my iPad mini 2 and iPhone 5s. Apple would nag me until I updated and now they're frustratingly slow. Fortunately on MacOS, you can turn update notifications off.
I wouldn't recommend a hackintosh to anyone. I'm a computer tech and it was quite a learning curve sorting through endless tech documents and forum posts. I wanted to give up a few times but there was nothing from Apple I could convince myself to buy. The prices for a Mac Pro (outdated garbage bin?)_ and the new MacBook Pro (non-replaceable SSD/ RAM) were ridiculous for what you actually got. I'd rather hold on to my 2012 cMBP with antiglare, quad i7, dual hard drives and 16GB RAM and just build the hackintosh for gaming and super intensive audio/video production.
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I thought about the white one, but I plan on using the 5 1/4 drive bay and most devices are black so I figured it would look better. I think Apple should have made all their devices black. If you consider the popularity of the jet black iPhone I think this makes sense. White is kinda going backwards although I used to love the look of the older white iMacs (at least the colour).