Quick suggestion: retain boosting ability by equipping a 5A power distributor. It can save your life if you intend to land a lot. As for the 7A scoop, remember that explorers visit thousands upon thousands of systems, so that "small" difference really adds up, and it becomes a lot more noticeable once your tanks took a significant drain, allowing you to top up faster while remaining cooler. Another small fact you may or may not be aware of, unlike ships you don't take a loss when you resell your modules, so there's nothing stopping you from selling that 7A scoop upon return to the bubble. In short, the 7A is definitely worth it if you can afford one.