Audacity is free and will allow you to record in wav format with a fairly high bit rate. Many cheaper condenser mics have a good frequency response and will replicate input quite accurately. If you are only using one mike you won't need a mixer. Audacity will also allow you to remove noise and change compression and equalization as well, and also overlay tracks. The price is right (free) and if you learn its bells and whistles you can come close to, but of course, never attain studio quality.