|>>|| No. 26962
Are you editing 4k video? If so, 8GB of RAM might struggle on more complicated projects, and the 1050ti too. It'll work, it just might be a bit frustrating. I work with audio and I can push my 32GB, sometimes. Like you say though, you're leaving room for expansion there. That cooler also looks suspiciously small and cheap, so I'd keep an eye on your temperatures with that thing, though it's worth a shot for a fiver.
If it was me I'd spend the extra for a GTX 1060 6GB, my thinking is that it's significantly better for modern gaming, and it's not my area of expertise, but I have to assume that video rendering is significantly quicker also. The latter has the real world advantage of saving you money on the electricity if your render times are shorter. The 1050ti is still decent, but I suspect you'll find it lacking a year or so down the line.
As >>26961 says, 450 is probably "just" enough to run that system, but you'd be right out of luck if you wanted to add a better graphics card later. And you'll definitely want a couple of TB of HDD space for video projects.
I apologise for my suggestions basically just bumping up your budget in three or four different ways, though.