A GWS Slow Stick, J-3 Cub or Tiger Moth would all be decent planes for flying around in a decent back yard, say 100 by 100 feet minimum. The Cub and the Moth would both need micro servos, but the GWS servos are pretty cheap, and if your not flying around others, their micro receiver is only about $29 with the crystal. (It's a single conversion receiver so can be "hit" by other transmitters on other channels.)

The Slow Stick can use standard servos but would fly better with mini servos. Try the Hitec HS-81's. They're a bit lighter than standard servos, but can still be used for larger stuff.

Good luck,
Dennis-