Quoted: I'd like to have the Colt barrel I already own fluted, because that is the most cost-effective solution. But, I don't know anything about aftermarket fluting, or the impact this will have on accuracy.
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Cost effective fluting? From where?
It's been my experience (had a couple of each) that fluting doesn't really shave off much weight. It reduces some, but not a lot. I've also never had any effect (positive or negative) on accuracy of my rack grade chrome lined barrels.
Also be aware that there's a LOT of ground between fluted and government profile. You could have it turned to .700 or .750. It would be lighter than flutes but stiffer (and heavier) than Govt.
If it were mine, I'd go .700, and I'd have one of the board supporting dealers (ADCO, KKF, AR15barrels.com) do the work.
I used to be a BIG fan of fluted barrels, and I know you should never say never, but the way I feel about it now, (costs more than profiling, doesn't lighten as much) I will NEVER have another barrel fluted to save weight.