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CameraWizOnly 1080p? You'll need a beast of a machine to power something like that as is. Unless you're shooting higher than 1080p then theres no point. 4k is here but isn't common enough to get real benefits.
Make the choice based on where you're at and where you'd like to be in 3 months video processing wise (if thats where you're going with this)
The choice is yours. I personally don't feel like going to 4k is worth it yet.