Desktop or laptop? I'm assuming primary purpose is gaming if you're looking at Alienware.
The only laptop that's really worth considering is the 17" model. It's fairly competitively priced with other 17" gaming laptops. The major issue is that Alienware has poor assembly quality control. You're more likely to need to repaste the CPU and GPU than with other brands. That's either an issue or it's not. The 13" is extremely expensive and the 15" you can get better price and quality from Clevo resellers (Sager/Eluktronics). The 17" the main competitor is MSI GT73VR. MSI GE Raider series is cheaper but not well built.
Desktop the Aurora. On the other hand, the Aurora uses pricey components that offer marginal benefits. For a solid mid-range build you're looking at around $1,400. Buying a discounted 7th generation prebuilt system is a much better value. You can pick one up easily for $800 and then add a second stick of RAM ($80) and Samsung 850 250 GB ($85). There's just not any good deals on prebuilt systems with the 8th generation i5-8400 as there's no supply. The few system builders that even have any are pricing them pretty high. Better to look at discounted systems with an i5-7400/7500 or 7th generation i7 chips for now until Intel is able to meet demand.
Alternatively, for a similar price you can get a discounted 7th generation i7 with a GTX 1080.
https://www.newegg.com/Product/Produ...82E16883102169