The Merkur 37c slant is the first thing that comes to mind. It's very similar to the 34c in many ways, but with the slant design you get an improvement in efficiency and smoothness.
The Razorock 'German 37' is a replica of an older Merkur slant and a touch more efficient than the current 37c. It is also a three-piece so you can customize the handle to suit yourself.
The Razorock 'German 37' is a replica of an older Merkur slant and a touch more efficient than the current 37c. It is also a three-piece so you can customize the handle to suit yourself.