Seconding the "don't buy a prebuilt, and definitely don't buy an Alienware" sentiment, if you can avoid it. Otherwise, err on the side of a higher-wattage PSU. The AC filter capacitors in the power supply lose their efficiency over time, which will reduce the PSU's maximum output below the manufacturer's rated wattage and thus introduce potential for other component failures, if not an outright fire hazard when the magic smoke escapes. This takes longer on a higher-wattage PSU because there are beefier filter capacitors in there; loss of capacitance matters a lot less if your usage patterns are well below peak capacity. The tradeoff being that if it's not an 80 Plus certified PSU (preferably Gold or higher), you're using more electricity to do the same amount of "work." With Dell/Alienware parts? I'd be shocked if it's even 80 Plus Bronze. Pun not intended

Regarding the specs list, Intel has some serious quality control issues on the 12th, 13th, and 14th generation CPUs, but I can't remember if that was strictly the i9 or K-series SKUs -- even setting aside BDS, I don't recommend them because of this.

Finally, with AMD bowing out of the higher-end GPU market, NVidia may be a necessary evil... That being said, you can probably score a hell of a deal on a Radeon 7900 XT or XTX nowadays. Failing that, a 7800 XT should be comparable to the 4070 Super.