I'd say Crucial P1 but I'm not too sure.

What I've heard the most so far is the Sabrent Rocket is the best available, and I'm using the 512gb variant without issue.

The Crucial P1 is great value for the money but if you want to spend the extra money you can get one with better read and write speeds, and the top of the line as you said is Samsung. The crucial has 2 gig read and 1.7 gig write so it should be fine for most users.

Case - My personal preference. Looks cool. You can edit that. Memory- Cheap, fast, and it has RGB on it, so it looks cool. Not much ram is cheaper than that as well. Storage - Hard drives are not needed anymore, so you should get an SSD. An M.2 is a faster SSD in a sense, so why not get that? You have tons of sata ports on the mobo so you can always add more storage if you need. Video Card - You get GTX 2080 performance for half the cost. Motherboard - Does the job for as cheap as possible. I never spend much money on these.

Edit: PSU - Is rated A tier on the PSU tier list, and is actually not expensive compared to other PSU's in that tier list. You also get 850 watts when most of these PSU's would give you less for the same price. This allows for upgradability and future proofing.