You can always hit up ebay for Socket 7 hardware. I keep a ton of it around. My current Dos/Windows98/ME gaming system I have thrown together is a Socket 7 AMD K6-3 400 mhz system. I paired it with a lan card, Geforce 256, and a AWE 32. So far it hasnt given me any problems. I use it to run stuff like Megarace, Screamers,Quake, Wolfenstien, Duke Nukem, Mortal Kombat, ect. Pretty much has me covered for DOS and Direct X gaming up to Direct X 6. Alot of Socket 7 hardware is just ATX and Micro ATX based, so you could easily use a newer style case and power supply if you need to. You can also go the Pentium 2/3 slot-1 way. 440BX was pretty reliable for its time. I have a friend who uses that platform specifically for his DOS box. Stuffs dirt cheap.