Er, um...gee, I prn Kylie and Kailee exactly the same! I wish I could hear you say it so I knew what the difference is. ;o)
I prefer the spelling Kailie, followed by Kailee (or KaiLee, if you feel that most people would prn Kailee the same as Kayley). I like the look of Kailey, but that looks too much like Bailey and invites the Kayley prn.