It matter's not one bit here if it's a Turbo, non turbo, STI, WRX as long as it has the badge is all that matters ;)
The non turbos can be great cars lose weight better suspension and brakes with the AWD can be quick cars. As for the insurance I think it's ringing around and finding what suits you and pocket. Compare sites work for a few, for me can't stand them and not interested in any little cuddly toy or plastic robot. Unfortunately with specialist insurance it is a case of ring them all like playing tennis and play them off each other. Just like it was when I first started to drive but only real way to get best quotes is try them all. But for many people specialist usually give the best deals on these types of cars.