Apple Users

I use Logic for a lot of mixdown work.

For the kind of work you're looking at doing you'll need 3 things

Microphone
Mic Preamp
ADC (analog to digital converter)

The Mic preamp and ADC may be combined in one unit like aforementioned MBox etc.

As for selecting a microphone, it's a personal choice to find one that best fits your voice and style. Professional quality microphones can run from around $99 for a Shure SM57 into many thousands of dollars for some large diaphragm condensors like the Neumann U87 etc. There are many economical choices on the market today so a bit of research at a local music store trying out mics can be helpful.

A mic I'd recommend looking at would be the Sennheiser MD421. I've got a few in my mic locker and I've used them on a lot of sources including male voiceover work as well as female vocals with good results on both

After the mic and a quality mic cable, the quality of the recorded signal rests mostly on the quality of the mic preamp and the quality of the ADC. The better they are, the better the signal quality you're going to get. Again, prices can run form a couple hundred bucks into many thousands depending on your budget and expectations.

In the "bang for the buck" preamp/interface category, I like some of the stuff Focusrite makes. For around $200-300 you can get a Focusrite Scarlett that doesn't sound bad at all. For around $700 you can get a Focusrite ISA One digital that IMO does a really nice impression of a high dollar mice pre.

Good luck!