How comfortable were you with the Terry? If you were fairly proficient with it, ie. you could control your direction, altitude, and attitude well, and the number of landings averaged out to the number of launches, you might be able to get away with the GWS Zero. The Mustang requires a little more experience, and I wouldn't recommend it for a first aileron equipped model. I would probably avoid the Watttage Sukhoi like the proverbial plague, if it's the one I remember(it's a bit of a winged brick with the recommended setup). If you were still learning with the Terry, I would suggest something like the Multiplex Space Scooter--it's an updated Sky Scooter with an optional rudder and a semi-symmetrical wing. All reports so far claim it to be pretty forgiving and agile.