if you want to update regularly, like if you are gonna use a relatively light setup, with little hardware, or without protools, I dont think you need the hackintosh route as from my own experience, in these conditions, the update is almost every time flawless and 100% resolved in a few weeks by all companies maximum. If you plan on using outdated sound cards, pro tools, and things like this, stability is more of an issue. But here, with Reaper and several very big brands plugin packs, I've never had an issue updating the Os from day one, because my setup is 100% ITB from big companies and reaper based.
Compare benchmarks of the CPU online, maybe that new dual core is not that bad for the price, I can't testify it. If you could compare to an early 2013 quadcore MBP15 retina I could tell you what I think of it, because I am very very comfortable with last year's entry quadcore performance. I can do a full mix of a mid / heavy session with mastering plugins on and be fine with it.