I don't know how many people here use Sound Forge, I don't. I think that Sound Forge does have a noise reduction tool that works similar to the one in Audacity. Check under the tools menu or look it up in your user manual.
Price isn't always an indicator of quality. Some you will be paying for the "Brand" and others you will pay for the technology. But, be wary of "too cheap" -- there's usually a reason it's cheap. There are different types of microphones and some of the technologies are more expensive to manufacture. Dynamic microphones are generally the least expensive and work well where you can be close to the sound source, but they tend to be noisy if you are trying to pick up quiet sounds at a distance. Condenser microphones are more expensive to manufacture but have a higher frequency response than dynamic microphones. Condenser microphones come in small and large diaphragm. The size of the diaphragm makes a big difference in sound. For voice, you want a large diaphragm which will have a better bass response and will give warmth to the voice. A small diaphragm will pick up highs better, but voice may sound weak or even tinny. There is a large variation in how microphones sound, even among different models from the same manufacturer.
A few tips: If you will be using the microphone in a studio setting where your mouth will be close to the microphone, you'll need a pop filter. This is just a mesh screen that blocks your breath from directly hitting the microphone causing a pop. A foam microphone cover will also work for this and is better in a outdoors setting where you can get wind noise in addition to pops. Condenser microphones require a preamp. This is often built into the microphone. Professional microphones typically use an XLR connection. Those types typically don't have the built-in preamp. Condenser microphones also need an external power source to place a charge on the diaphragm, USB microphones pick that up from the USB power connection, Professional microphones with an XLR connection require a "phantom power" source which is typically built into the mixer or preamp unit.