Hi bro, nice to see u post a tank thread here, I think u have most of the basic equipment but you will have to decide what you want to keep. Example the equipment for keep FOWLR and SPS tank will be totally different. But the main equipment will be the same, like skimmer, go for the best within your budget and remember to ensure the skimmer can fit into the sump. Other thing that u need is bio material like biohome plus, bio ring, etc... to bring down nitrate.
For equipment there is a lot of brand out there with different design and pricing, but in general what u paid is what u get, for german brand equipment, we are paying a lot for for reliability and performance. For performance, now a lot of the China brand do come out with similar design with good performance at a lower price tag, but reliability is a big question. Hope it is helpful.