EDIT: That turned into a large block of text. Tried formatting to make it less offensive. the TL;DR is this:
Not saying don’t get that stuff, just trying to help prioritize what to get right now based on my past experiences. Won’t ring true for everyone, but I can only give input from my point of view
The sound in Evolve is amazing. You will definitely benefit from having a nice sound output device.
HOWEVER: When you’re building a computer, you are building something that is going to last several years, and be used for everything from gaming, to homework, to job work, to online banking. While you can replace parts here and there, it’s best to start out with the best foundation possible so you can keep your upgrades minimal through out the years.
Additionally, not everyone is a computer building hobbyist that loves tearing their computer apart every couple months to make an upgrade. Heck, I’m a computer building hobbyist and I avoid taking my computer apart like the plague.
Things that are external to the tower are easy to upgrade, and can sometimes run expensive. While the age old adage of “You get what you pay for” doesn’t necessarily mean that the most expensive item is the best, it generally means that putting out a little extra on them can increase user experience.
Because of all of that, I typically recommend building the computer itself (everything in the tower) with the best stuff you can afford. While a TV generally makes a bad PC gaming display (they have much high response times and are typically meant to be viewed from further away than a PC display normally is), it works for a while so that you can save up for a better monitor later. Gaming keyboards, gaming mice, etc, all work much better than the 10 dollar generic keyboards and mice you can get, but the cheap interface devices work fine while you save up for something fancy. Same for cheap speakers vs. high end surround simulating headset.
All of those things are REALLY easy to replace or install. You get a better hard drive and it will take you forever to build up the willpower to migrate all of your data over and reinstall the OS and all that. I’ve had a 1TB SSD sitting on my desk for months to replace 500GB SSD raid I use for my gaming drive. Even as a hobbyist that sounds like a terrible way to spend my day.