Game Cam

I'm already thinking about my April trip to Spain to play Airsoft in Valencia.

I want to take my WE Thompson which runs on Green gas.

I know I'm going to have pick up the Gas when I get there and I don't wanna buy too much there so I am thinking about getting a side arm that runs on green gas so I can get one gas for both.

I'm thinking of a full metal M9 but can't decide which one.

I'm thinking WE because

1. Popular so loads of spare parts

2. Same make as Thompson

3. Not massively expensive

Anyone got any recommendations?