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go with a good windows based laptop with the specs you want, get rid of the Windows 8 junk on it & install Linux on it. Then you'd have the hardware covered and the software.. Mac Os X and linux are in essence the same (Unix/Linux) otherwise you're really just buying into the Apple name. Although a desktop would be even more powerful for editing.
"good windows based laptop" no such thing
"Mac Os X and linux are in essence the same" just like Porsche and Volkswagen are in essence the same
I regularly go on rotation between a MacBook Air and a dual boot Ubuntu/Win 7 HP Elitebook. For video editing software at the entry level, nothing beats iMovie. At the prosumer level, nothing beats Final Cut Pro. Maybe I'm just missing the competing options for Linux, the ones I've used I like better than almost everything on Windows, but not as much as the Apple software.