Audio Equipment and Home Theater Audio : Microphone Help

Microphone Help

Okay so I've been researching mics for a couple of days now and for the life of me I cannot figure out the differences between microphones. I mean I've found a $30,000 mic and a $200 mic and the both seem virtually the same (or at least similar enough for me to wonder why there is such a huge cost difference between the two) so could someone please to me what makes a microphone good or bad?

Here are the two mics and their specs I was talking about:

By 1965 there'll be total depravity. How squalid everything will be!