I don't know if an aftermarket system will work or not, but I'd go with OEM. I'd get a set of steelies being sold on eBay or whatnot. There seem to be quite a few at any given time... but if it comes with tires, make sure they are the Contis rather than the Hankooks. I wouldn't trust those things- from experience.
Also, NYC, I don't think you really need snow tires at all. I have no intention of buying them in central Jersey, and it's slightly warmer in the city itself. I have gotten by without them for my entire driving life, and excluding my ML350, all of my cars, my other van, and my box truck have all been RWD without traction control- and I have never had any trouble with driving around. I mean presuming I am using appropriate caution, same as with any drive system.
I mean if it was FWD, you'd definitely need snow tires, but RWD?