Interesting to see some people picking builds that can cover as much as possible in that period and others picking their two most nostalgic builds.
The two most seminal games for me are Wing Commander III (or a WWII flight sim like European Air War / Aces of [insert any of the series here]) and either Half Life 2 or Company of Heroes 1. That puts two of my favourite moments circa 1995-1998 and then again 2005-2007. I'd love to include a 486 or 5x86 in there as the spectrum is so wide and once you go Pentium, they're all in that same long line of Pentiums until the Athlons briefly held the crown.
So I'd need a high end DX, so that means a DX4-100 or I'd probably dig out a Cyrix 5x86 100GP I picked up earlier this year. That covers me for the early stuff but I have a long gap until being able to run Company of Heroes at high resolutions and smooth frame rates on Ultra - I believe it was roughly the 8800GTX before you started not having to worry about stuttering (that, and patches, COH was notoriously buggy).
Ideally it would be three builds but if it's just the two, I would probably have to drop the Cyrix build and go with the two I'm currently messing with now:
1997-98 - in my sig
2006-2008 - Athlon FX-60, DFI LanParty NF4-SLI 'Venus', Geforce 7950 GX2 quad SLI (if I can ever get it to work 🤣)
I dislike emulators and setmul and prefer building period-correct but in this case and with limited builds, I think it covers my favourite time periods quite well. But if I could throw in a Tualatin build with a GeForce 3 Ti 500 for good DOS compatibility in there somewhere...