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Most AR15 conversion rifles are going for $16-19k these days.
Surprisingly it doesnt seem to be much difference if its a Colt or Non-colt. Typically you would think Colt would carry a premium but most of the Colt Ar15 are slab side and not very desirable based on their looks.
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The looks of the slab side don't bother me -- a more significant difference is that the Colt front takedown pin is oversize and not captive. Still, you can have M60joe sleeve it down, but it won't be captive.
That said, I prefer a Colt host because it is far more in-spec than any of the non-Colt hosts available pre-1986. In decades of tinkering with RRs, I have only come across one ex-semi Colt with a functional issue -- the autosear pin hole was drilled slightly off by the person who did the Form 1 -- and that was very easily fixed. Compare that to the host of issues I've seen non-Colts need (though in fairness, by now many of those have been corrected).
YMMV.