First off. Congratzs. I'm still looking for my 1st rainbow. Now on to your dilemma.

Personally, I would combine them, and hope for a +1/+1. I've never been a fan of dupes in my Aigis army, and feel the same about FKG. Plus it will take alot off resources to max both of them out. I'm don't know about you, but I wouldn't have the patience to max the same girl twice.