audigy4 vs audigy 2

I checked the last 15 pages of posts didnt see anything.I am just curios what are the differences between the two cards other than price?I wanna get the audigy 4 but can more likely afford the audigy 2 while i usually buy what i cant afford and rough it lol.please help me make a decision around 280 is a lot of money for a sound card i also ordered logitech z-5500 yesterday.I am looking for the best sound card for games and dvd,music.i dont do to much other than listen to music watch dvds and play games i would like however to be able to fine tune the sound as far as music editing but i would like to have the ability to do so.

pentium 4 3.2
oczpc3500 el ddr platinum matched ddr433
western digital raptor 74 gig 10k rpm
8knxp gigabyte
geforce 4 titanium 4600(i know get a faster card)soon!