I always use Novatech. If you're video editing I'd go for at least an i5 processor with at least 4 GB RAM. I have a 250 Gig C: drive which is adequate for OS and software. I keep all data on other drives - I have 3 x 500 Gig HDDs internally and 5 externals for backups. It's belt and braces but I never have less than 2 copies of any photos or video.
iMac Pro review