alternate cable routing

Hi!
I currently have a 9-speed bike but in the future would like to upgrade to a 10-speed slowly. And am going to buy some new shifters very soon. I have looked on Sheldon brown's website and it says I can use 10 speed shifters with a 9 speed cassette using alternate cable routing. My question is would I have to use a 10 speed front derailer? The levers I am planning to buy are; Shimano STI Levers 105 Black 5700/5703.
thanks
I currently have a 9-speed bike but in the future would like to upgrade to a 10-speed slowly. And am going to buy some new shifters very soon. I have looked on Sheldon brown's website and it says I can use 10 speed shifters with a 9 speed cassette using alternate cable routing. My question is would I have to use a 10 speed front derailer? The levers I am planning to buy are; Shimano STI Levers 105 Black 5700/5703.
thanks
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however, the rear shifter will have one extra click, it may take some time to get indexing sorted .
i'd advise getting a 10 spd cassette at the same time as shifter, possibly a 10 spd rear mech as well if you need to. these are the least expensive parts.
Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails
The alternative of trying to use 10 speed shifters with a 9 speed chain / cassette will involve buying something like a Jtek Shiftmate, which would then be redundant when you upgrade the chain and cassette to 10 speed.