If you're anxious, but not impatient, you could order an external case and a PX716A or PX716SA from one of the places below:
PC Connection had a December only additional $50 rebate (in addition to Plextor's on going through March 31st, 2005, $30 rebate)
PX716A due in Jan 15th, 2005 http://www.pcconnection.com/ProductDetail?Sku=5422309
PX716SA (no rebate) http://www.buy.com/retail/product.asp?sku=10389160&loc=2065
Cases depend on preference (USB 2.0, Firewire 400/800 or SATA)
Cooldrives.com and QualityCables.com are affiliated and have superior pricing and selection. We purchase frequently from them and for some reason they aren't real well known. Usually best pricing and selection. ie: http://www.cooldrives.com/5usb20fiopdr.html has an Oxford 911 chip (fastest)
Also see:http://www.newegg.com/app/ViewProductDesc.asp?description=17-155-213&depa=0 if USB only (great price) or
There are many others to select from, sort of like buying shoes.
Newegg has some user comments and reviews on some products.
These aren't the only places on earth, but a suggestion to get you started.
There's always going to be something, better, faster and cheaper coming. Don't go nuts waiting and waiting.
Good Luck.....It's not difficult once you know what you want in the end.