About a year ago I downloaded all of ocremix at that time, and chucked it into my iTunes playlisting. When I first saw that someone had decided to remix Rainbow Road (which I should point is probably my favourite non-remixed game tune, so I might be bias), I decided I'd take a listen, and at first was very unimpressed.
However this tune has grow on me over time, and I feel stands head-and-shoulders above anything else (not being insulting to the other remixes). It dares to combine a number of styles, and do things which are unexpected and unusual. Truely a great remix of a great song