Before you invest in an expensive setup, you need to know what your plants need.
In the case of LED, you need a smaller extractor than with HPS because you have to extract less heat. If the room temperatures are high, you want to extract more and preferably not back into the room where the tent is located.
A TS3000 (450w) is perfect for a 3x3-4x4. In a 5x5 it will shine less light around the edges of the tent.
For ventilation you could use 2-3 clip fans in addition to the extraction that hangs at the top of your tent.
My tip, invest in the climate by means of a good extractor + filter and 3 clip fans in the corners. Measure carefully what temperature it is in the tent before adjusting your extractor.
If all goes well, you can always invest in a slightly heavier lamp such as a 600w LED fixture in the future.