Unless I find very good deal elsewhere (ebay.de/bazos/etc..) I buy everything from Alza, can pick it up quickly by car and their warranty process is unmatched :- ).
3950X/Asus Strix-E, Noctua NH-D15, Fractal Define C, 4x Noctua a12x25(PWM) for airflow, Samsung 970 Evo (1 TB) for system drive, 860 Evo for storage (3x 2TB).
GPU of your choice (I still suggest used 1080ti because of low price and 11GB Vram, Vram is everything, it's king).
(This one like all workstations in our office will have Quadro RTX 5000 for the 16GB Vram, performance of which is the same as 1080ti and the Quadro driver is total...unimpressive crap ? If anyone wondered if they are worth the price...if there really is some magic. None...at....all. )