linguos :
Would it still be recommended to build my own? Like is that ryzen 5 2600 much better from vapour's post?
You are saving a fair bit of Money from a new build at least $300 to $500 and the deal that you are getting will, I repeat, will provide an excellent gaming and productivity platform for your sound editing. The 2600 is a 6 core 12 thread CPU and the 1700 is a 8 core 16 thread CPU and on the editing side will be a bit better.
I cannot really see spending more unless you really think you are going to be pushing the envelope as the 1700 will do a great job stock for both gaming and productivity and of course you can upgrade at a later date. And yes you can overclock to at least 3.9GHz all core. The 2700 will be better, but not that much better and they to are limited in terms of overclocking maxing out at 4.1GHz ish all core, yes they can go to 4.2/3 on single and dual core but that's it.
Bottom line, if money is not an issue, yep go for a new build, if it is an issue and you would like to keep to a budget, then a $1000 for the system you are being offered is actually a very good deal with good CPU, RAM, GPU and Power Supply, and will more than handle your use case.