Pro carbon is nice.
As to cpu, that's going to highly depend on the usage. The R7 is a tad bit better then the R5, but it costs more. If you aren't using it though, it's kinda wasted. If you figure games are/can be optimized for 8 threads, the first 2-4 threads take the lions share of abuse, so a 6 core +2HT does very well, better than a quad +4HT, but not quite as good as full 8 core. But the 2700x has another 8 possible threads that do nothing but take up cpu bandwidth, power, heat. If streaming, that's different, then you can use all 16 threads, so that's viable justification. For most gaming, the R5 is plenty, if that's the main interest.
Cooling. Common thought is not accurate. Actually it's dead wrong for most cpus and OC. The bigger cpus are @100w and once you add a decent OC can reach close to 200w±. Aircoolers such as the big twins like a Noctua NH-D15/S are 250w+ rated. They can handle anything most consumer cpus can output. The only advantage the AIO's hold is a 350w+ limit, but otherwise, with a 200w OC output, aircooling = liquid cooling. ± a few °C depending on the cooler.
So you really don't need liquid or the expense to OC. Don't, get me wrong, I love my nzxt Kraken X61, but that's more for aesthetics reasons than performance. It was also $60 at the time I got it, so cheaper than aircooling. Wouldn't mind getting a fractal design Celsius s36, but I'd also need a new case and I can't justify tossing out my Define R5.[/quote]
I do record gameplay and stream on occasions using OBS. So I could prolly make use of the extra threads.
I could really use a new case too, currently have a mid tower that I have been displeased with. Any cheap Recommendations?