I'm using the Epox G2 with 1meg onboard cache, and i LOVE it!
It's got a lot of nice features (Like shutting down your computer if the CPU gets to hot), 2 ISA Slots, 5 PCI and one AGP x2.
It's fast, it's stable, and it's one of the few SS7 motherboards compatible with the K6-!!!+ CPU's (2 volts)
Another bonus is 133 MHz FSB (not officially supported, still trying to figure out how to run PC133 RAM on it - After i won 'em

)
As for overclocking, i haven't had any succes with my K6-!!! 450 - but it just seems like that particular CPU is impossible to overclock, but it supports FSB speeds of 95, 100, 112, 124 and 133 - very nice
I's recommend this mobo to anyone using a SS7 CPU, since it's easy to use (dip-switches), it's fast and it's stable - I had my old win98se running for a week without any reboots with the RAM running CL2 just hosting FTP, doing some power surfing and working in 3D studio MAX.... i think that is rather impressive!
It should be mentioned that I've heard some rumours about the G5 version of the motherboard (2meg onboard) is supposed to be a bit unstable, but my G2 runs like a charm!
If you plan on using a K6-!!! on the motherboard, get ready for multitasking heaven! - the tri-level cache architecture speeds up your windows like you wouldn't believe it! - I serioulsy doubt that you can find a better CPU for multitasking than the K6-!!! running with a lot of L3 Cache....