Thank you for the good advice so far.
I am still undecided; on one hand, I agree with Roadrunner that I was leaning initially toward the 11, but Ronbo613 has good pros for the 13, so let me give some more info that might help:
I demoed both for a good 30 minutes each, and I did not feel a significant difference between the 2 in regards to speed, maneuverability, or stability, but then again, I did not venture out of the secluded bay into the "open water" (i.e. where the power boats roam/wake zone)
I unfortunately did not try to lift each out of the water to get a feeling of the weight. I am not that athletic, but I am not a weakling either...But i do not know how it would be to car top (BTW, I need to buy a rack as well, which means more cost, unless I could get away with a quickstrap rack, which I may have to do, as due to my job I change cars every 9-12 months)
As far as storage space, I already lost my parking space to my kid's toys, but I could reclaim half of it, so the size difference may not matter that much in this regard.
Now, if I decide for the 11, I may have to wait until 4-6 weeks, and then, why not wait an additional month or so for the 2015s? But then I lost again another season...
Somebody wiser than me could help me make up my mind?