Shifter Options for 105 3x9 upgrade
Current 105/Ultegra/Dura-ace are more than 9 speed, so you can't use them. Plus, the old 105 or tiagra 9 speed shifters you'll get are probably the same as the current Sora shifters anyway, due to trickle down technology (just with tiny modifications and a price premium).

So, in short, if you're sticking with 9 speed, don't bother -- you'll just pay more for a different sticker on the shifters.