external drive enclosure ?sata drives

[mgmediaworks]

So i understand the best performance comes from external drives. not internal at all..So i thought about getting a esata card for my mac pro and getting an enclosure to host my audio drive and my sound library drive.. which one are you using.?

I found this card for the mac pro.

$70
http://www.cwol.com/serial-ata/caldigit ... dapter.htm

and this enclosure which is
$160
http://www.granitedigital.com/index.asp ... ProdID=387


oh and for the laptop
$100
http://www.sonnettech.com/product/tempo ... ess34.html



or is anyone here using internal and working well?