Of course I'v 'way biased, but your SuperTigre GS-40 will fly your Hobbico Avistar very nicely. You'll notice quite a bit of power increase over the .40 LA. The main thing with 'Tigres is to bet them well broken-in, and to adjust then correctly. The instruction book and the web page are great resources:
http://www.supertigre.com/faq/product-faq.html