I've got UE7s as they are said to be a bit of the "industry standard." That said, I've got friends that have gone with 1964s and JH Audio... The Westones I've seen look a little dodgy, but those were being toured rather heavy... Depending on which brand you go with, you can get molds for the same price as universals... The trick with any IEM is fit. If it doesn't fit well, you won't be comfortable and they won't sound as good as they could... so you could have quad-drivers or better, but if the fit/seal isn't good, it won't matter than much. For that reason, I strongly suggest going for molds by the aforementioned brands if you can afford it-- stay away from "affordable" alternatives (i.e. Alien Ears, etc.). You get what you pay for, and when it comes to this sort of thing, you want to be able hear everything as much as possible. Don't skimp.