I've been riding a 1999 (i think) GT Force. It has Shimano RSX components on it (brifters, front/rear derailleurs, hubs). I know Shimano doesn't make the RSX line anymore, but what is it's equivalent current lineup (Sora, Tiagra...)? I hope to upgrade to a new bike sometime within the next year with 105's or Ultega on it, but I'm just going to make the best of what I have now. Thanks for any information anyone might have.