Whch toolbox gives most money for the buck?

I have the option to buy one of the toolboxes: Which one is the most cost effective?

Partial Differential Equation Toolbox
Communications System Toolbox
Image Processing Toolbox
Image Acquisition Toolbox
Data Acquisition Toolbox   
Instrument Control Toolbox
SimPowerSystems

I mean from the poin ot view that they have the most functions , Simulink blocks and coolness of what you can do with them.

[Star Strider]

What is your intended application or area of study?

[timo]

Engineering, Math, Control Systems, embedded Systems

Answer 1

[timo]

I will get Image Processing Toolbox if no one complains as beeing useless and not cool

Answer 2

[Steven]

Only buy what you need, If you don't know what it is, you probably don't need it. That being said, image detection is cool, go with the Image Processing toolbox.

[timo]

Ok , that seems a good option

Answer 3

[timo]

OK i bought SimpowerSystems and Control System Toolbox -_-''