Dell's Precision 330 would be my choice for 'best' Pentium 4 desktop of 2001. With 10,000 RPM Ultra 160 SCSI hard disks as standard, Diamond FireGL 2 with 64MB AGP graphics, up to 2GB RDRAM (4x 512MB RIMMs), 4 FireWire ports, 1 USB port, Intel 850 chipset, you get a lot of bang for a lot of buck. You can get all docs and drivers from Dell even today, see the original configuration based on Service Tag number, etc. Dell's manuals page:
https://www.dell.com/support/home/us/en/04/product-support/product/precision-330/manuals
Reviews were generally very good to great, with cost being the primary negative. One example:
https://www.zdnet.com/product/dell-precision-330/
Precision workstations were and are in general built to very high standards and typically run very well for their age. Pricing is pretty good on eBay for these sorts of systems. I would rather have a five year old Precision than a low-end 2018 machine; in the case of my laptop, a Dell Precision M6700 with Core i7-3740QM, I would have to go to the higher mid-range current generation machines to get comparable performance, and I paid less than what a lower-end machine with a current generation i3 would cost (I paid about $550 for this one, off-lease and low usage two years ago).
EDIT: I have a 2001-vintage Precision 530MT here somewhere, but it's not a Pentium 4, it's a dual Xeon, but most of the same statements apply to it that apply to the 330, but the 330 was P4 single-proc. This 530MT is equipped with the RAMbus riser cards that allowed up to 4GB of RAM, and this was the first 4GB system I had seen.