Hi Bravo78,
What kind of games do you play ?
Considering the MP is designed for CQB/CQC, if you are doing MIl-sim games, then the MP really dosn´t fit in a field environment,
For overall versatility, I would go with the G36C from either JG or CA, both are well built, will take a beating and still keep on delivering great performance, both have their advantages and disadvantages, the JG is not as pricey as the CA models, but it is lacking in detail, and their GB´s are not designed for really high end tuning possibilities, on the other hand, CA makes nice detailed G36´s, with solid GB´s to take a M150 Spring, but they are expensive.
I personally would take the JG, and I am a hardcore CA fan, the JG delivers more for the money.