I would recommend a Parkflyers Cessna 182. Simple to assemble, easy to fly, very stable airplane. Plenty of power with stock equipment - also can run as is with 2 cell li-po battery.

They are currently selling the 3-channel version for under $100 and the 4-channel version starting bid is around $120 on E-bay. I think the regular prices are $139 and $179 respectively.
They come ready to fly with everything included except the 8 AA cells for the transmitter.
The 4-channel version is much better, of course.

Check them out at www.parkflyers.com

Good luck!