You chose: HDD - 1TB Western Digital Caviar Blue. You want the Black version instead (faster, better performance).
Yes, you need SSD. Spending this must money on a pimp rig, only to have to wait on a slow hard drive? With SSD, everything is insanely snappy (opening programs, booting up, etc). Get 120GB SSD at minimum.
You need extra hard drives for this reason: install OS + editing software on SSD; have the source files on WDBlack#1, use WDBlack#2 (or SSD...) for the 'scratch drive'; use WDBlack#3 to export the finished product to. This way you maximise the performance.
32GB RAM is overkill for gaming, and should be plenty for video editing too. You can always purchase another pack of RAM to put in at a later time, if you need to.