For a "qv" model the g is imoressive in my books. The qv usually was a "sporty" car and a gta was an all out racer. So the qv in terms of performance is right where it should be. A gti competitor. A gta should be in the s3/golf R range where performance is concearned. And yes you can do a lot worse at the price.
Ian, I agreed with you on the QV as GTi and GTA as R, that's why I am happy with my GQV, purely because I know my car is much better than the GTi (yes, this is very subjective)!
I really do not see the GTA will come out for the G, considering it has to have a 4wd system, where Fiat does not have at the moment. Although, a higher power engine would not be a problem for AR. But the current R&D budget are just for Guilia and the spider, probably the CUV too. So there are no money left for a GTA.