That is a very vague question. What are you trying to record? Vocals, instruments, nature, etc...? For vocals it then comes down to the average pitch of the people that you will be recording. I currently own 8 different microphones and i am constantly out looking for more that excel at certain freq. that my current mics do, but dont excel at. A good place to start is to come up with a budget and then lots of reading of reviews on as many websites that you can find. A good place that i start is amazon, since they do sell almost everything, and then from there i read reviews and ask local producers if they have or currently own that mic. Talking to the people at the music equipment stores does no good. They are out ot just get a sale and, in all honesty, have not one clue about the product they are selling. Every mic is different, even if it is the same model and everything. Once you get one, start using it and testing it out. A "good" producer can take a basic mic and make it sound amazing. But, major label studios actually have a cabinet or two full of mics and the engineer knows the pros and cons of each one.