I've looked at both boards n I'm just about to build a machine so I'm going to swap my S v2 for the SG2...
Ok so theres less tweakability in the SG2 and you loose the Firewire but u gain GBLAN 2 more USB and the SATA's moved from the SI chip to the Southbridge, no idea what difference that makes but hey...
Out for a bit 2nite after work n then back to mine, do a few disk checks and then rebuild the machine with the new board, could most likely just change the drivers but its been at least 2 months since my last reinstall so why not?
Let you know what the gen is later...
...unless I blow something up