If you want the Will Lee Signature features, you won’t be disappointed by the MIJ MetroLine. Roger himself has stated that the reason to order an NYC vs. a MIJ Metro were wood choices (really nice on that NYC Satin Deluxe!) and other custom options (chambering/lower weight also nice to have). But, he said, and others who own both have confirmed, that a MIJ Metro is every bit the Sadowsky bass that an NYC is.
Before I bought my used MIJ Metro, I asked a professional musician who had several Sadowskys, both MIJ and NYC, about the differences. He told me that if he A/B’d them in a studio, same strings, same everything, he could hear a very slight difference between a chambered NYC and the non-chambered Metro. But he said the difference was so small as to be insignificant anywhere other than in a studio setting, and even there it was very small. Fit and finish (woods aside) he stated were equivalent, flawless on both.
If it were me, and the cost wasn’t an issue, I’d probably pony for the NYC Satin DLX, but that is because I’d like the upgraded veneer and prefer the hum-canceling pickups. If I wanted the mid-boost, smaller nut and single-coils (which you do), I’d absolutely pull the trigger on the Metro. While you can swap pups on the NYC, you can’t make it into a WL Sig.
Choices, choices...