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I feel ya on the 6.8SPC, but you can get .243 in an AR platform. I don't know if anyone makes an off the shelf upper for it, but the components do exist to build it. I've personally just skipped right over those when looking cause I have a Remington 788 in that caliber for a hunting rifle.
i'm eyeballing this one....it'll just take me a little bit longer to save for it. we'll see what i can find. good news is, i just realized i get paid 3 times this month, so i'll have more money than i was planning for.