AI that deals with keeping the plane in one piece
and dogfighting? Even taking into account the AI routines used on those magnificent quadracopters that've been shown all over the internet playing ping pong, we're a good distance away from realtime, fully AI'd flying of RC planes in wind - let alone dogfighting.
Oh, and if you've "engaged in a collision" in an RC craft, much like the real thing - no AI control will save you or your plane. One or both planes will drop out of the sky, the bodies will likely break severely, and if you're very unlucky you'll bend a crankshaft or crack open a servo/RX unit.
I admire your imagination, I really do!
BTW, 300 what a month? £'s? $'s? Rubles? Rupees?