I'm guessing you are referring to shifting on the front rings. If so, the single best upgrade you can make (and cheapest) is to change to a 105 FD. See my post above. Last year I changed from Sora RD and Tiagra FD to 105 front and back for very little money (I stayed with 9sp). Keep the Sora shifters for now. Unless you get a screaming deal on some used brifters, it doesn't make sense to change them unless they are broken.