Welcome to Rebel Forum.
Don't have the 650D, but have the 2 previous Rebels. Audio capture varies with circumstances. Both of the Rodes are nice, should also think about off camera audio. I have a small mounted Sony Shotgun with a Alexsis recorder off, serves my purposes. The only quantifier is the prices.
Magic Lantern for 650D should be out soon. I believe its being tested, but I didn't see it in the Nightly Builds. Wait for v2.4 anyway.
Like Olga said, the Video Forum should have more experts.