What software are you using? What work loads are you estimating you'll be rendering for? Budget rendering is a tough one...I stayed away and most folks I know doing budget builds for this are very, very very patient with their rendering jobs or gave up and repurposed for gaming rigs and spent the money to get the right system for the task. There's a saying, use the right tool for the job. A cheap budget build isn't the right system for rendering, but, in that breath...depending on said budget it can be accomplished fairly decently.
I've deployed 750Ti's for structural engineers, but not for animations and rendering... odds are you'll be relying on your CPU for the rendering workload honestly though. For true rendering you'd need a workstation class card build for that purpose, which can cost a helluva lot. What is your budget? You say keep it cheap...you won't get a great or even good rendering card for cheap...though depending on the level of cheap you might get something that works well.
Non-ECC = Not Error Correcting Code Memory -
https://en.wikipedia.org/wiki/ECC_memory , Server and high-end workstation-class systems will rely on ECC when data/project integrity is critical.
For that system build, 650W is more than enough. You could slap a 980Ti, 1070, 1080, Titan, and 650W would be enough.
AND
You have created a lot of threads lately that you don't really follow up on, for that purpose I want you to know I have reported your post on this thread and notified TPU staff of your recent activity so they can decide for themselves if your actions are worth anything negative or not.
I am not entirely sure if you are the issue or not, but you have gotten a lot of attention from TPU members trying to help you (some in less than appropriate ways), and you either stop responding or create another thread. I replied to one of your threads in the GPU section when you were asking questions about the 1060 vs 1070, I inquired about your 1070 thread and had some questions. You never replied...instead you moved on.
This makes me question what you're doing here, and I apologize for saying this, but makes me question how genuine your request for assistance and suggestions truly are. I hope you are genuine in your need for help here, and I hope we can get you in a spot where you stop making TPU members get frustrated at you and each other like your last thread had unfortunately accomplished. I also hope my perspective of your recent actions is incorrect.
but if you sort on lowest price first, you'll find some affordable ones.