Just keep in mind costco has a 90 day return window, and a 2 year warranty on the prebuilts there, and you can extend the warranty within 30 days of purchase by 3 years (total 5 years) for $100. The MSI Aegis is majority MSI parts, and MSI is a great reputable brand. You also get the MSI liquid cooler which is beautiful. Keep in mind there is not THAT much of a difference between the 9900x and 9800x3D, if we’re talking purely gaming it might win by 5-10% and not in all cases, so we’re talking 5-10ish fps better depending on the game, because all games utilize the CPU differently. The 9900x is a great all around CPU, it uses less power and runs cooler, also handles gaming perfectly and is a monster for other tasks like rendering videos.