Is the internal sound card really good, or should I get a different one?

I was looking at the GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX All Solid Capacitor Intel Motherboard, for a high-end gaming computer. It has internal sound card, but should I get a different one? If so which one? And is there a different MoBo you'd recommend also?

Is the internal sound card really good, or should I get a different one?
Internal sound card lacks the extra muscle that produced by the game or music video. As long the sound chipset is labeled as 'High Definition' is well considered. Add external sound card to existing motherboard that already has internal audio chipset (sound) won't degrade sound quality.