It is one of the best GB for fp given the low cost and amount of fp. looking at level 13 it does cost 948 but using a 1.9 group you will only pay 529 on that level. With mine at level 60 I would have to have a lower need for fp than now to even think about deleting it. When you look at level 59 it cost 2951 but with a 1.9 group you pay only 242.
The real question is want do you want your city to do? and how to develop your city to do that.
I have only one city that is a general propose city that I want to give high fp, to fight(troops and boost) and make goods, because I want it to fo so many things it is not the best at any one thing, however I am happy with my city and game play. There is no single prefect city for all players and no magic set of GBs that every one has and is happy with.