What system you need is (partially) a function of what you want to achieve. Read the following guidelines to help you decide on which kind of PC you are going to install Vox Studio:
Windows requirements
CPU and speed requirements
Memory requirements
Display requirements
Disk space requirements
Sound card requirements
Microphone requirements
Headphone requirements
Speaker requirements
Studio requirements
In addition, before you purchase a Vox Studio license you should run the free evaluation version of Vox Studio on the same PC, just to make sure there are no unexpected incompatibilities.