Of the choices mentioned by the OP I think I'd go with the Tantal, (from the web):
1) The gas tube is floated between the gas block and the rear sight support. It does not touch the handguard. The handguard is supported by an extended lower handguard flange and the rear sight support.
2) The muzzle brake has been modified to also function as a grenade launcher.
3) The Tantal comes with a side-folding stock that mounts just like a fixed buttstock. It does not require a different rear trunnion, but mounts on a standard trunnion in the normal fashion. It can be quickly and easily interchanged with a fixed stock. Most military sidefolding stocks are build on dedicated receivers, and cannot be converted to fixed stocks.
4) The gas block has been modified to accept a bipod. Standard NATO bipods will fit this version.
It also has a cold hammer forged chrome plated bore barrel and the reputation of being one of the best made AK's on the current market...