I don't have a mid-range, perse. The cheaper mics. tend to play up the higher register. The more expensive mics. For my voice the AKG 414 down plays the high and accentuates the low, which is better for me. The Neumans give equal emphasis, which I don't want for my voice.
Microphones are plentiful and fill a wide range of circumstances.
There's no doubt that the Neuman and AKG condenser mics. are among the very best. They are also pricey. If you have any problem with exterior noise in your recording area or booth, you may want to steer away from the phantom powered condensers. Many of them are so sensitive they can practically pick up the sound of your toenails growing. In this case I would suggest a good dynamic cardiod which has a tendancy to drop off dramatically when sounds are more than a foot away from the element.