Currently I'm using a Futaba 401Y with a Futaba 9254 Ultra high speed Dig servo (A little overkill actually)... This is really a Heli gyro but it works VERY well!. I have the gain set to my Aux2 switch and usually run it with 25% gain. That seems to be the majic#. If you not familiar with a Gyro setup it's actually quite easy. You don't even need a "remote" radio function to control the gain. You can simply set the gyro to the beginner settings and off you go. Just be sure not to turn the gain up very high on the gyro as it will cause the tail to "hunt" (making it wiggle back and forth). On this plane I will SWEAR by the tail gyro as it makes this plane seem like it's flying on a rail! High spped turns are amazing! I'll come accross the runway do 100+ and bank it tight 180 deg horzontally. With the gyro I do not have to add ANY rudder and the plane doesn't drop an inch during the high attack turn.
A better choice of gyro's MIGHT be a Futaba GYA352:
http://www2.towerhobbies.com/cgi-bin...?&I=LXBBE6&P=7
Dual axis Heading hold gyro that is designed for planes. I'm looking at adding one to my 1/4 scale extra for doing torque rolls.