I plan to buy an iMac. I'm into video editing my gopro footage, photography, creating southpark style animations, photoshop, illustrator, & indesign. I've narrowed it down to two BTO 27" iMacs. Both with the i7 and 2gig VRAM. But I am torn between ordering one with a 3TB fusion drive for $2,394 or one with a 512GB SSD for $2,594. Any thoughts?