I've got a buddy that wakeboards at the professional level and his opinion is G23 followed by SA for best wake out there.

At your level I doubt you would really even notice a difference in the wakes from SA to SL (not a dig!) and you'll learn and progress just fine behind either one.

My SA 400 at 1/2-3/4 ballast is magic IMO. Once you fill the ballast all the way up the wake is huge but the motor isn't thrilled to be pulling all that weigh along at 22mph. It will do it just fine it's just working near or at it's max.