Re: What to upgrade first
GPU that's normal temp and honestly good considering the cramped case.
CPU kinda hot but not terrible.
You've already got a good base setup. Basically all you need to do is upgrade the GPU to get the frames and settings you want. IMO the case you're wanting is a bit much, even if you want to grow into it but to each their own. A good start for a PSU would be the Seasonic M1211 620. You can use what you currently have for CPU/mobo/RAM and put something like a GTX 780 to greatly increase frames at higher settings.
The only problem I can see is the motherboard in those looks rather proprietary.
Edit: Scratch that, appears to be standard mITX.
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