This Genuine Leather Case
is what I bought. I got a screen protector from the same site.
Haven't had a single issue with the Momax Crystal Protector
and S-Pen - certainly seems very responsive to touch. I tried the multitouch apps after I got the protector and found phone extremely responsive to all fingers on the screen so I doubt it's an issue. I got the plastic because I figured maybe the softer material would provide a bit more shatter protection on the off chance I dropped it. (& it was cheaper
Note that my case DOESN'T fold but it wasn't a concern for me. They have This Case, Leather and Fold
that might give you an idea of what to look for in the US - or get it shipped.
I was more interested in the extra card (3) and cash pocket