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Flight Pro Sim is actually the Open Source (and free) flight simulator FlightGear.
Whether it would add more possibilities than MS FX is debatable. The graphics aren't as polished, but some of the systems and FDM detail are better.
If you like playing around and modifying the simulator, it's great, as it's all open source and therefore designed to be modified by the user.
So, rather than buying Flight Pro Sim, I'd recommend downloading FlightGear for free from http://www.flightgear.org
What exactly do you mean when you say you 'have enough computer' for all three? Do you mean your processes has enough RAM and memory to run all three programs? I've not used FlightGear or Flight Pro Slim but I'm sure you can find an online coupon for both of them. Hope this helps! Feel free to send me a message if you have any other questions!