As far as components go, at the time I think RX100 was the same as 105, the difference was the finish. RX100 was polished, 105 was painted (or lacquered). The finish on 105 flaked though...
My intention was to upgrade the bike with Ultegra parts (or Dura Ace, I wished!) but I never did. It HAS been treated to a pair of Mavic Reflex 32 CDs on Ultegra 6700, still running with 8 speed though! Plus it also sports a white San Marco Rolls saddle... CLASSIC!!
TT bike, Sunday club ride bike, good old-fashioned (but unfashionable) name... love being different!
Ought to put some pictures up I suppose.