What would be a good mod for the Ego Mega tank?

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So, I just bought an ego mega since it looks like a nice, peaceful way into starting the process of learning TC and building, though I also bought some stock coils, as well as some rebuildable, TC ones.... I'm hoping I'll learn as I go. What would be a reasonable mod to go with that? I want to buy at least one more mod before July 4th to take advantage of sales, and in case something goes wrong with my other mod?

Any suggestions? I'm willing to buy something nice, as long as TC is reliable...

What would be a good mod for the Ego Mega tank?

What would be a good mod for the Ego Mega tank?