That is very thin and you can easily do that with an entry level laser of 40W. You should also consider the bed size and not limit yourself necessarily to what you are cutting now but what you might do in the future.
I would recommend Our Category 1 Agnes 40W laser and can give you 20% off of the retail.
Category 1 Agnes - 40W Desktop Laser - Lasers - Products
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The Hurricane Laser Team