Hmm, yes, I agree on your points there. The X1 has the side slot higher up(for cooling the CPU) rather than the graphics card.
I could recommend your case for the mid-end build. You have any other suggestions? What to you think of the Carbide 330R in the high-end build? I find that a good one for highend gaming builds.
Update: What about the ONE S3? It's a little expensive than the X1, but I could fit it for mid-end.
http://www.antecindia.co.in/product.php?id=NzA0NDAz
http://www.snapdeal.com/product/antec-one-s3-cpu-cabinet/1251850