Tested A LOT of super 7 boards (since I'm a huge fan of the platform). Here's my top 3:
1. AOpen AX59-PRO - ATX, 4 PCI, 3 ISA, AGP, 3 SDRAM, 2 SIMM, Supports FSB up to 125MHz (officially), 143 unofficially, VIA MVP3 Based, VIA 686B ATA66 Southbridge - supports voltages from 1.3 to 3.8V in 0.05v increments
2. Lucky Tech P5MVP3 99X - AT, 3 PCI, 3 ISA, AGP, 2 SDRAM, 2 SIMM, supports FSB up to 112MHz (officially), up to 125MHz unofficially, VIA MVP3 based, VIA 686B ATA66 SB on the 99X version - oficially the most stable and reliable super 7 board I have ever tested. Fast and reliable, and cheap / plentiful in eastern europe. Good overclocker too. Stay away from very early revisions, they have the VIA ATA data corruption bug.
3. Epox MVP3G-M -ATX, 5 PCI, 2 ISA, AGP, 3 SDRAM, 2 SIMM, Supports FSB up to 133MHz !!!, VIA MVP3 Based, VIA 686B ATA66 Southbridge on some models - supports voltages from 2.0 to 3.5V - great for overclocking.
- ASUS P5A - ATX, 5 PCI, 3 ISA, AGP, 3 SDRAM, supports FSB up to 120MHz, ALi Aladdin V based, supports voltages from 2.0 to 3.5V in 0.1V increments - best ALi Aladdin V motherboard by far. Has minor AGP issues with some video cards. The ALi chipset can perform better then the MVP3 chipset when it comes to memory performance, but these boards can be fragile so handle with care and don't use for testing parts or benchmarking.
- Chaintech 5AGM2 - AT, 3 PCI, 3 ISA, AGP, 2 SDRAM, 2 SIMM, supports FSB up to 100MHz (officially), up to 125MHz unofficially, VIA MVP3 based - great VRM, excellent system stability and overclocking potential. Limited voltage options. One of the few boards tested that runs stable with faster / newer video cards (tested successfully even with a 6800 AGP) while other comparable boards have trouble running stable with a geforce 4.
- FIC PA 2013 (rev 1.3) - ATX, 4 PCI, 2 ISA, AGP, supports FSB up to 124 MHz, supports low voltages for K6-3+ / K6-2+, VIA MVP3 Based - note that early revisions do not have an AGP voltage regulator and may act up with hungrier video cards.