If you're looking for something to start with, the favorite trainers are the hubsan, the syma x5c and the udi u818.

I bought a u818a and I've had a blast with it.

http://www.amazon.com/UDI-U818A-2-4GHz-RC-Quadcopter/dp/B00D3IN11Q/ref=sr_1_1?s=toys-and-games&ie=UTF8&qid=1432324144&sr=1-1&keywords=udi+u818a

http://www.amazon.com/Syma-2-4GHz-4-Channel-Quadcopter-Camera/dp/B00J684YNG/ref=sr_1_1?s=electronics&ie=UTF8&qid=1432324275&sr=1-1

Edit: It looks like your "Discovery" is actually an updated u818a with a better camera. In that case, go for it!

My only warning for you is that despite their physical size these quads are very, very light. You won't be able to fly them in more than a light breeze.