External HDD for audio samples

[Andrew Tarpinian]

I'm getting a external solely for storing audio libraries for plug- 
ins, ie: east west orchestra stuff , machine, NI, etc... My machine is  
a laptop, it has 1 firewire 800 port, USBports, and an Express card/34  
slot. My audio interface is going into the firewire so I could daisy  
chain off the interface but don't think that is optimal. I could get a  
eSATA or Firewire 800 Express card. Or just do USB. What interface  
makes audio the happiest?