Time to bring the ahri complaints to an immediate screeching halt, here's how to counter
instead of rushing your precious 500 mana instead invest in early 
its really that simple
Don't even wait just get boots when you hit 300g. Ahri isn't going to do anything to your tower. Ahri loves towers and tends to stroke the large phallic objects rather gently early on later getting excitable and rough with it after she's gotten her freaky hat and boots on.
http://www.albinoblacksheep.com/text/bloodninja
No need to upgrade your boots, could help but you really don't need to, this should be enough movespeed. If you need more get
otherwise just get 
"but muh mana"
youre playing against ahri, dodge enough stuff with any defense on and she wont be able to finish you for a while. Do not trade with her unless she comes onto you, don't overstay, get some damn 
And for fucks sake whatever you do, do not get cocky just because she is intentionally letting you shove her lane, be afraid!
AND CALL YOUR DAMN MIAS!
this message is brought to you by the Ahri fancult Ahri, the only champ that actually matters No bias whatsoever
#AhriFancultBanner