You do not have to purchase Measurement Studio in addition to the Vision Development Module. The Vision Development Module includes ActiveX controls for acquiring, analyzing, and viewing images.
If in addition to this functionality, you also need 1) user interface controls such as graphs, knobs, slides, or numeric edits; 2) numerical analysis functionality; or 3) additional acquisition interfaces such as NI-DAQ or NI-VISA, you might want to also purchase Measurement Studio.
To answer your questions:
1) If you are unsure of exactly what package you need, you should call your local sales office and speak to a sales representative directly. You can find the number by clicking Contact NI, above.
2) Measurement Studio 6.0 can work with Vision Development M
odule 7, but Measurement Studio 7.0 is the latest version of Measurement Studio. Measurement Studio 7.0 includes support for both Visual Studio .NET 2003 and Visual Studio 6.0. So, this is the version of Measurement Studio that you should get if you need it.