Ask for suggestions for hardware to use. You should use this tag in questions asking for advice relative to hardware compatibility and preferences.
You want to buy a new piece of hardware, but don't know what will work nicely with your shiny new Ubuntu install?
Shopping recommendations are mostly offtopic, however you can follow this guide to ensure that your question is more focused:
When asking questions on this topic be sure to be as specific as possible in your needs to avoid your question receiving general opinion-based instead of factual answers backed up by user experience.