You may consider using a basic 12v linear actuator. They will never achieve a speed of >1m/s, but then, thats fast for pneumatics. Motorized actuators essentially use a leadscrew powered by a motor which suits the load and speed needs.
Any of
these actuators should suit your needs. I filtered the search to show high-speed actuators.
Also, they also present the cost benefit. These will probably never hit $200.
To control their position, you will need a sensor kit. I believe
http://automationdirect.com sells them, don't remember the price. As to speed control, basic PWM will do the trick.
Don't be affraid of trying new things... Even if people say you are crazy, even if you get insulted, even if it involves a lot of time and money, try it. You can't know if it'll work or not if you didn't try it yet. - EDesbiens [more] 
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