There are lots of good choices and people have strong opinions about favorites. The Steeler was good, but spacing is different and as has been mentioned, it's not available. The OFR is the original and works great. The Gotoh is a solid option, and the one that was used on the MM EVH/Axis and is Suhr's current choice for his guitars. It also fits the same spacing as an OFR and is more affordable (not to be confused with cheap, it's a solid unit). Schallers are great too, and, they make the OFR so, basically the same thing. Hard to go wrong with any of those choices.
I really like the Ibz Edge too, but hard to get a body routed for it unless you are going for a full Ibanez-type build.