Let me discuss RTX 3080 (if available) system prices in EUR.
Code:
Item Cheap Low Fair Silent Upgrade High
---------------------------------------------------------------------------------------------
GPU 700 700 700 720 720 800
CPU 45 170 260 260 400 800
RAM 45 50 100 100 200 200
Storage 15 50 90 90 100 300
Mainboard 50 110 140 140 160 300
PSU 45 80 100 240 240 240
Case 40 70 80 130 130 200
Cooling 0 0 0 160 160 700
Misc 0 0 0 30 30 30
---------------------------------------------------------------------------------------------
Sum 940 1230 1470 1870 2140 3570
Difference -530 -240 0 +400 +670 +2100
In theory, a Cheap build is below €1000 but falls apart from watching it. A Low Build for some €1200 requires compromises with CPU (might bottleneck the GPU), RAM (many sample positions are impossible) and mainboard (VRAM runs hot). A Fair build (also typical Youtube build) approaches €1500 but makes intermediate or somewhat loud noise.
Silence (ca. 37 dB or less) adds €400 resulting in about €1900. The PSU is the major factor when doubling the watt to run it at ca. 50% for lowest noise. (The alternative is a passive 700W PSU saving €40 but risking occasional power failures.) A silent CPU cooler costs €60 - 100 (or more, if you prefer). Silent case fans add €30 - 80. Miscellaneous includes a GPU stand and extra PWM cables to some fans.
I have not listed RGB, but you might spend, say, +€200 on that.
An Upgrade build for +€270 (compared to the Silent build) yielding some €2100 includes a faster (but not the fastest gaming) CPU, doubles the RAM and chooses a mainboard with even better VRM temperatures. If you don't need silence, you spend ca. €1750.
The High End build for almost €3600 is not excessive but includes the fastest gaming CPU, a large PCIe 4.0 SSD, a medium to high end priced mainboard (but not one for two GPUs 4 PCIe slots apart, then the mainboard is €400 - 600) and a rough estimate of water cooling.
The wide range of expense is really interesting. One can chicken out but it makes little sense if one actually wants to use the GPU well. €1500 is the expected price of a system but a strict desire for silence adds another ca. €400. It is always tempting to get the best of everything but I think one should compromise on the CPU unless one also wants to use the PC for CPU intensive non-Go tasks. You can save €100 if you consider 32GB RAM sufficient. As explained earlier, building a 2 GPU system is expensive and difficult.
I guess I will go for something between Silent and Upgrade. What are your plans?