Most people won't use firewire. Do you think you'll purchase a DV camera?
Edit: Wait, it says both have firewire. The second board has more better SATA support. I don't see firewire ports in the back, so it must be front firewire. But if you can get PCI-E for the same price, go with the second board.
Can you live with one 3 PCI slots?
Instead of having multiple NIC cards on one PC, you can always get a decent router cheap, which I recommend. The system has 8 channel sound on board, and does anyone really use dial-up models anymore?