Generally not a bad idea to add a flamethrower or 2, they'll save your marines a little bit of health. Also, don't recycle the barracks unless you intend to replace it with something else. If you still haven't finished building on your base, just keep it until you need the space for something else.
I made a flow-chart for those of us who struggle with English as a first language:
http://img202.imageshack.us/img202/2711/dumbass.png
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2v2 with ChainsOfAnarchy: 21-1