I've never bought a car from CarMax but I did sell them my 2007 E90 335i. They were easy to work with and they definitely have a large selection of vehicles. $300 is a lot of money to transfer a car but after gas and food etc, picking it up wouldn't be too much cheaper.
You can most likely find the silver trim you're looking for on this forum within a month or two so don't let that be your deciding factor between the two cars. That's more of a want item, not a need item. If the local car is everything you want besides the trim, I'd buy that one.
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N54
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