Firstly are you running an aftermarket ECu and what is it's abilities for resolution in ms.
When it comes to Injector sizing these days since the advent of the Bosch EV 14 Series and the modified versions available from such people as Injector Dynamics and Five0 Motorsport even a stock Honda Civic 1600 can run and idle with 1000cc Injectors,gone are the days of needing staged injectors such as used on the Ford Cosworth RS 500 Sierra.
Therefore when looking at injectors you can in many cases go for the size you are planning for future mods and use it on an earlier build spec engine sucessfully so only needing to buy one set of injectors for say a normally aspirated build that you plan to Turbo later.
These injectors will work very well with either engine spec so check out someone like Injector Dynamics for information,and when you actually talk to dyno operators with experience of them they will tell you just how nicely engines tune up on these injectors.
If you have never usewd them before I highly recommend checking them out as they really do work superbly.