Pretty much what the other guys said.
Anything 2010 and later is good. Btw I have the 2010 Centaur Ultrashift 10s shifters and they are flawless and multiple shift.
I think I could live with PS shifters which is all the late model 10s shifters. Have to move to Chorus 11s for Ultrashift aka multiple shift.
Late model shifters are less complex and also the most durable...a very solid design. 2009 was a transistional year and should be avoided...bugs weren't worked out.
You could either simply ebay your derailleurs and go with a 11s groupset without brakes and crank if you have brakes...I personally would dump square taper as well...or you can do it on the cheap and go Veloce PS shifters but have single shift. Probably hard to find 2010 Centaur shifters and I ain't selling mine.
