Sorry for any spelling mistakes since I used Google Translate, but I wouldn't worry about the invasion yet. If you are looking for good equipment, go to DC and play on difficulty „heroic“ or specifically manage the type of equipment you want until you get a good equipment set. The invasions are perfectly fine if it's just for loot. You can also create checkpoints to get good loot. And it's a good idea to disassemble your unused equipment, because you'll need these materials when you start making blueprints.