As far as expansion for power, line size will not be the problem. Even with -6 line, it will flow more at the 60 or so lbs of pressure the lsx engines need than you will ever use.
I think the need of a surge tank with the cell vs the stock tank and pump set up is what would make the biggest difference for me. Either will work fine. IT's just, how much do you want to change at this point?
You will want a surge tank if you stick with the cell. The first time the car dies in a corner, you will hate it.