as far as I'm aware, the gotoh one is at least as good as the schaller one... the schaller one is kind of stiff too (the one I tried, anyway), which I don't really like (that's personal preference, though), though I'm guessing you could address that with a different number of springs etc. But I have heard other people saying schallers have quite a stiff feel too.
measuring is the most important bit, though. if you email schaller, they'll send you routing templates, wd have the gotoh one on their website, as do floyd rose. it's more than likely, if you do decide to upgrade, that you'll have to end up going for the one that fits, lol.