I took the liberty of removing the cards from my PC (with the exception of the WiFi card and the Floppy drive). Which one am I going to need to buy again?

From left to right:
SCSI HDD (Holds WindowsXP and Windows98)
Phone Card
NVidia GeForce (Don't really care since I'm going to get a GTX)
SCSI Adapter
Serial/Parallel Communications Ports
Oldass 512MB Ram Cards (Don't really care)
Not in the picture:
Floppy Drive
Netgear WPN311 WiFi Adapter.
You're quite correct that IDE works with x64. However, my point was that a brand new x64 mobo (likely this as he was asking about it earlier) does not have IDE ports.
But an IDE adapter card exists, right? .....right?