What exactly are the issues you experience with SBLive? I used to have one installed in my VIA-based SS7 board, and don't recall anything particularly terrible.
My best guess: it probably depends on the southbridge. The 686A was used on some of the last MVP3 boards, and although it was generally superior to the old 586B and 596A/B, it had the well-publicized PCI bus mastering issues with the Creative SBLive cards. Absolutely no idea what the current status of those issues is with whatever Windows 98 or XP drivers are available, but it might be something to bear in mind. Possibly leileilol is referring to experiences with 686A-based boards and you had one with an older southbridge.
ALi Aladdin V had something similar with early nVidia AGP chipsets (TNT series). There again it was supposedly mitigated in later drivers, but I don't know to what extent.
To answer the OP's question, as meljor says, SiS also had an AGPset, but it was slower - or rather: it was only really stable at 95MHz, 100MHz wasn't always attainable. Whether it counts as "Super Socket 7" without that is a matter of definitions.
Complete list of So7 AGP chipsets.
Aladdin V (100MHz FSB (officially, but good boards regularly OCd to 133MHz))
5591 (83MHz FSB (advertised), although sometimes 95MHz or 100MHz was acheived)
VP3 (66MHz FSB (officially) / 83MHz FSB (most actual motherboard implementations))
MVP3 (100MHz FSB)
All three vendors als had UMA architecture chipsets with integrated AGP graphics but no slot - the ALi Aladdin 7 (which is the one chipset I really, really regret getting my hands on - dual channel SDR-SDRAM to avoid the usual UMA memory bottleneck and an ArtX VGA core that would later go on to form the basis of ATi's Radeon family), SiS 530 and 540, and the Via MVP4 - all with 100MHz FSB support. The SiS 530 in particular was very popular in the low-end around 2000, but performed badly and was generally used on absolutely awful motherboards, giving it a reputation for unreliability that it didn't really deserve.
Personally I'd say I like the elegance of the Aladdin V the most if aiming for high performance, but in terms of memory support and general flexibility it's hard to beat the MVP3. I was using an MVP3-based system with K6-2 500 for a few years as my main system around ~2001. Ran Windows 98SE like a dream.