Need some help on injector sizing for he341/S471 twins

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Everywhere I have read, I am seeing I need to go with SDX for injectors. So, I am wondering what size yall suggest for an he341/S471 twins setup. The kit will be hitting around 70 psi. I will be running an edge drag comp for now, and will be adding a smarty down the road and probably water/meth. So, I am wondering what you are suggesting for sizing? I am thinking either the 220's or 240's. I will be driving the truck in traffic daily and it will be in downtown atlanta, so I dont want it to be too smokey on lower levels with the tuner, but want to be able to let loose some smoke when I turn it up. Also, I dont plan to do much towing of anything heavy and will prolly taking this truck to the strip on the occasional weekend. Thanks guys!

-Greg