Where are you located and basically what’s your budget?
It might be a strange time to build a computer. There are good options for many parts, but the most important for Blender, which is the GPU, is very hard to get for a reasonable price.
If I had to build a pc for me right now, I would probably go for a branded pre-built rig, accordingly to my budget. That’s the easiest way to have access to a high-end gpu for a reasonable price these days.
I ordered a custom PC from CyberPowerPC in late February and it’s due to arrive on Monday. It’s got an i9 processor, 32GB ram, 500GB SSD + a 3TB mechanical drive, an RTX3080 10GB, and it’s liquid cooled. I paid $2777 including tax.
I know many people don’t like CyberPower due to their customer service, but I haven’t had any issues (yet) and this is the second PC I’ve ordered from them.
I’ve owned Dells in the past without problems, but I wanted to customize mine and get exactly what I wanted instead of settling for what Dell offered.
Origin is good I hear, and so is iBuyPower. My advice is to read the forums from each company to see what their customers are saying.