I bought the Abit NF7-S when I fried my Asus A7V-333 rev 1.0 trying to drop a XP +2400 in it. I needed an emergency board, and had been pleased with an old Kt133 Abit I bought awhile back. The board had a good layout, although if you have a GF4 the Dimms are very close to the end of it and quite a few ppl have knocked off chips there. The serial ATA has an adapter for current hard drives. Mine never worked. Yes, it has the optical out. The sound on it is first rate, on output that is. The mic has a serious problem and for me that was a no go. I do a lot of voice comms with the teams that I play with.
I was able to push the fsb up to 175 with PC3000. The ram timings in the bios allow you to get as low as 1-2-2-2 cas 2.0, although I could only get it stable at 4-2-2-2 2.0. The only other problem had to do with the Audigy Gamer card I was running. There was some sort of IRQ problem that would end up making the Audigy "screech" as if it was digitally scratched. This was in several games that I played. I had to have the audigy because the mic input didnt work. So you can imagine the headache that this caused.
Overall, 9 days later I returned the board. I had to exchange so I picked up what I was beginning to read as the most overclockable nForce2 board- the EPoX 8RDA/+. I have this board running at 185 fsb. Its extremely stable. The sound card problems all got worked out. The deal is though, that this board is not certified as a "Soundstorm Sound" version because it lacks the digital out.
This chipset is currently the fastest out for the athlons. The new revisions all allow you to throw in a Barton. Also, its necessary to update your bios no matter which board you get, as there have been a lot of fixes that I have seen for both Abit and EPoX. There are reports of problems with the EPoX board and Corsair XMS PC3200 ram, if the bios is set to SPD, it can lock it up.