Honestly, there is no high end AK. Not in the sense as applied to the AR (Les Baer, etc) The best available is probably the Vepr. It is impressively tight, including the "pencil box" lid secured with a redesigned push button. Overall fit and finish is AK deluxe, but would be considered average on a western made rifle.
The market and supply of AK type semiautos is so fluid and inconsistent, due to the mix and match foreign and domestic parts, that I just can't single out one brand you can trust. My bias is toward the Saiga, an all-new factory production. I liked the IOS, all US made, but have not fired it yet.