You're got a heavily modded car for the street, so a tune won't hurt. You won't need a tune necessarily just to run well. The MAF will take care of the injector sizes, so you don't have to worry about that. 24 is only a notch up from stock, so that's not too serious a change, but yay for computers because it's all taken care of with MAF calibration.
But if you still have more plans, hold off on the tune until you get everything done.
Edit: I misread about your injectors, but even with 30lb it doesn't matter. Just make sure you have the right calibration for the MAF, get good fuel pressure and that's your fuel system worries taken care of.