ah i'm with you now. Depends what you're looking for really. If the Cf bonnet is just for effect then vinyl wrap would be a better/cheaper option. If it's weight, the fibreglass ones would be better, but you would have to get it sprayed I would imagine. Saying that, I think the CF bonnets are partly fibre glass anyway, so weight wise there probably isn't much in it really.
You would be suprised how much difference in weight they are really. The ali bonnets on the PH1 are very very light imo. So fibre glass would be lighter still. All depends on how deap the pockets are, and whether you could get some ITB's second hand for cheap.