dDiego...

You could build a [link=https://www.balsastore.com/store/proddetail.php?prod=434]Stick 40 plus[/link], that an old kit, but an easy build or you could only order the plan, so you'll have to cut and sand every part plus buy all the hardward of your liking.

You could also build an [link=http://www.sigmfg.com/IndexText/SIGRC67.html]Sig LT-40[/link] wich seems to be the best trainer ( at least from what I've read here)

Plus, RCKen make a real usefull thread in the beginner forum for the trainer, look up in this thread, you'll see a link to it
[link]http://www.rcuniverse.com/forum/m_4537845/tm.htm[/link]

Good luck.

SDG666

P.S.: Beware, it's a very addictive hobby, when you start, there no stop!!! DOH!