Your GPU will not block you RAM slots. The only reason you would go for the mini is because your case only supports that size. You should go for the full sized one as it will likely produce better thermals.
I don't know which case your looking at but it should list the maximum length graphics card supported. As long as the length of your 1050ti is shorter than that you should be golden. Further I HIGHLY doubt there are any 1050ti's that are so large as to impact case choice outside a few very small HTCP form factor ones.
If you decide to go with the case Kostattoo listed you won't have any issues at all. PCpartpicker has builds with some absolute beast warrior graphics cards in them.
My two cents on the CPU / GPU choice: Go with the highest clocked Kabylake chip you can afford. This could be a i3 / i5 / "iwhatever". WoW LOVES high CPU clock speeds. I doubt you will notice a difference between an i3 / i5 in WoW alone. But each "0.1" GHz speed increase will net a few extra FPS. A few extra FPS doesn't sound impressive until you start adding them together. A few here and a few there and pretty soon you're talking 15-20 extra FPS. For my money, on a WoW box, I would go with the i3 7100 / 1050ti. That should handle settings level 7 (former ultra) at very good frame rates.