Here's links to OCRemixes...
Frog's Theme - I'm pretty sure that Ailsean's Knights Come Marching Home is an orchestrated version...It might mix in some theme from FFIX though, I forget...but it's pretty good. I couldn't imagine GrayLightning's mix being suck, but I haven't heard it or most of the songs there, really...
Battle With Magus - Zeratul's Blue Minded God is good, though I don't recall if it was orchestrated or not...All of Children of the Monkey Machine's renditions are great, but far from orchestrated and are kind of hit or miss with most people (it's kind of dark, industrial-sounding stuff)...I see Beatdrop made a mix of it as well, he's definately one of my favs over there...but I haven't heard it or the others...
To Far Away Times - I have no idea about these ones...In fact, I think there might be some others with these themes at OCR, but that they or the remixer didn't know the name of the original song or whatever...I forget even which song was To Far Away Times...was that the one that was the intro/Chrono's theme?
Man, I just realized how far behind I am on all the remixes & stuff...V_V