Stupid Mistake

Arrgh... I'm slowly starting to get some of the stuff I need to upgrade my computer, so today I placed an order on Newegg for a 250 GB Seagate Barracuda HD, Acronis True Image 11, and an external enclosure for the HD.(The stuff I need to back up my data.) I didn't realize until after placing the order that the enclosure was for a 2.5" laptop HD, not a 3.5" desktop HD. Doh! I managed to cancel the order, but now I have to wait 2-3 business days for Newegg to credit my account so I can order what I actually want. *sigh* Oh well...

My current setup:
Antec 900 chassis
Windows XP Pro SP2
3.2 Ghz HT P4 (number 640) LGA 775
Via P4M-800Pro MB
Nvidia GeForce 7300 GT (AGP 8x)
250 GB Seagate Barricuda HD
2 GB DDR2 800 RAM

What it will be after upgrading:
Antec 900 chassis
Windows XP Pro SP2
3.2 Ghz HT P4 (number 640) LGA 775
ASUS Nvidia nforce 780i MB
Nvidia GeForce 8800 GT (PCI-E 2.0)
250 GB Seagate Barricuda HD
2 GB DDR2 1200 RAM