Injectors...biggest I can or not??

[turbocarslut]

All,

First off...I have an AEM EMS.

I am in the process of replacing some dead stock injectors and decided to just go ahead and upgrade the fuel system now. I don't have much on the engine other than 3" DP and exhaust, FMIC, and Walbro fuel pump. I want to go with bigger injectors because down the line I will upgrade the turbo and mani. I saw some 550cc, 720cc, and 850cc over at Phase2...they are all pretty much the same price. So my question is...should I just get the 850cc now? Will I have any street driving problems or idle problems? A good tuner should be able to tune any size injector right? What should I do?