Whatever gearing works for you. I will say 17x46 works nicely for me but there have been times I have ridden with people doing more casual rides and gone a little to fast so...
In the end I think a 144 crank can go down to a 42 and the largest EAI cog is an 18t so that is your lowest gear but I know Sugino has some crazy big chainrings so you can go pretty crazy at the high end though a larger set up on both ends is going to be more efficient just as an FYI.