How is this DFI better for you than an Ultra-D? Is it less expensive? I don't know much about it.
Although the Ultra-D has two 16x VGA slots, don't think that implies SLI. Think of it as giving you flexibility in where you place your VGA, allowing for more cooling options of your nF4 chip. Unless the DAGF is a lot less expensive, I guess I don't see the point.
The LanParty boards only have 2 PCI "classic" slots where as the DAGF has 3. This is important should you have a sound card, a modem, and still want something open for the future, since there are essentially zero PCIe x1 peripherals around.