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Between the 680i LT and the 680i the difference is that the LT supports memory speeds up to 800mhz and the 680i up to 1200mhz on EPP memory(the ones with the SLI certified logo).The 122-CK-NF63-TR is certainly the best bang for your buck and still support 1333 FSB.
heres a link to a evga faq...
Unless you got like $ 300 studio headphones you wont notice the difference between onboard and a sound card.The only real reason in my opinion to go for a sound card would be to ease the load on the cpu which will only happen with a Creative x-fi(xtrememusic,xtremegamer and platinum only) and...