Wiring Some New Can Lights

I am going to install some can lights throughout the house soon.  I have one light in the center of each room that is already wired up.  I will be patching the existing light boxes up to run the new can lights, utilizing the wiring that is already present. 



When hooking the extra lights up should I use 12/2 or 14/2 wire for running them in parallel?  There will probably be no more than 3 or 4 can lights per room ran with CFLs.  The current lights that are in each room take up to 3 bulbs per fixture.
      


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