Help with PS3 accessories?

all you need is the game. if you don't play ps2 games, then you dont need backwards compatibility. don't need the card reader... and if you do any usb card reader will do the trick. you may need the cable if you want to go with a wired connection. all you'll need is 2 usb ports unless you're playing rock band, and then you'll need a powered usb hub. and i don't know wht sacd playback is, but i'm guessing you can live with out it.