If you're getting Resharper just to handle usings, don't spend the money. VS2015 added that functionality.

>Hmm, 'using's are namespaces, references are DLLs.
>If you're talking about adding 'using's then get ReSharper - it's pretty smart at working out what's needed.
>If you are talking about references it would make no sense to add them ALL - you would end up with a huge number of unused dlls when deployed.