I think if you are actually wanting to learn RC on a tight budget, the Parkzone Slo V is the way to go for the space you have said. It has basic 3 channel control so that you can get the most out of it without having an aileron plane. The Aero Ace is a whole lot of fun, but I use mine only for front yard flying. I don't really consider it an actually trainer, the controls are way to simple It's still a great airplane though.

For $140, the [link=http://hobbyzone.com/rc_planes_parkzone_slo-v.htm]Slo-V[/link] (or Challenger if you get a bigger space) is the way to go.