I have the Symphony 1.8 and can't comment on the other 2. I'm looking to buy.the 2.2 to increase my pull. I think you'll find any of those kites to be a blast to fly but you may want to move up in size later. I recently asked HQ what the difference was between the 'Beach' models and the 'Pro' models. This is what they said:
We offer two versions of the Symphony to allow for different budgets and preferences. Both kites are great flyers and excellent for a wide range of pilots, however the Symphony pro series is the higher end option with a sewn bridle and higher grade Ripstop-Nylon material, while the Beach series is considered entry level and has a knotted bridle and Ripstop-Polyester fabric.
The choice is yours but I thought you might want to be aware of this if you compare price/quality of the Symphony kite to the Prism