High-quality (modern?) PSU for an old PC

Hello, I stumbled on this site by chance, but I believe you will be able to help me out. I'm building an ultimate retro gaming PC to cover DOS/Win95/Win98 games. Here's the config:

case: AeroCool XPredator X3 White
motherboard: ABit KT7A-RAID
CPU: AMD Athlon XP-M 2500+ (mobile Barton)
RAM: 2x256MB SDRAM
graphics cards:
*3dfx Voodoo5 5500
*Rendition Verite 2200
*Gigabyte Radeon 8500 128MB
sound cardsL
*Diamond MonsterSound MX300
*Creative Sound Blaster Live! 5.1
*Creative Sound Blaster AWE64 Gold
monitor: Dell 21" P1130 Trinitron
keyboard: IBM Model M
mouse: MicroSoft Intellimouse Explorer 3.0

Even though I'm making a retro PC, I don't care to make it look authentic, as you can see I'm going to use a modern case. And so, I also want to use a good modern power supply too. I first thought I'll go with Seasonic Platinum 400W Fanless, which I thought is powerful enough and really high quality, but after a closer look, on the 3.3V and 5V rails it only has 20A/20A and 100W combined, and as far as I know those old machines do use the 3.3V and 5V rails quite a lot. I tried looking at what other power supplies are up for sale and their stats, and I couldnt find one with satisfying stats in the shops around here. Is there even any modern unit that provides plenty of power on the 3.3V and 5V rails? I have an old Point Of View Black Diamond 500W lying around, that according to its stats provides 34A on the 3.3V and 40A on the 5V rails, with combined 250W. But it makes a weird noise, and was a pretty cheap unit, I dont think it's even 80+ certified, since I bought it quite cheap.

Which model would you recommend? If possible one with Platinum or at least Gold certification :) Thanks in advance!

High-quality (modern?) PSU for an old PC