What does it matter if we have a good image quality if the sound doesn´t match the quality.
After, reading and listening to several samples, I came to the following conclusions:
Rode VideoMic Proc, your best companion. It’s a directional mic, appeared to me that it’s the best solution to upgrade from the sound offered from your camera. The best option to minimize the wind on the mic, Micover seemed to do a better job.
Rode iXY and Rode Stereo VideoMic Pro, both are stereo microphones. The iXY, was built to be used with an iPhone/iPod and the Stereo VideoMic Pro with your camera or a digital recorder, both products seem really good for capturing ambient sounds, in a place recording some music or outdoor recording wild life.
Rode smartLav lavalier micro, one more solution to be used with an iPhone/iPod. Really good alternative to the more expensive solutions that exists on the market.