yeah, i have to concur with phattyb. The peripherals are the real reason to go NF4. Also, SATA-II is pretty nice. Then again, i just ordered my NF4 SLI yesterday, so i might be a bit biased. Seriously though, your upgrade path will be much better with NF4, and NF3 socket 939 boards just aren't cheap enough to recommend an NF3 mobo.
BTW, the next audigy is in the works right now, and is called "Zenith." Also, terratec is making a dolby digital live card soon, so all you soundstormtroopers can stop bitching temporarily, lol.