Pluto, Gunnm Recommendations
If you love sci-fi, especially cyberpunk, these are for you. Both of them have interesting plot, and fascinating action involving cyborgs and highly developed robots. And both main characters have lost their memories.
1) Pluto is detective manga, while Gunnm is not.
2) Gunnm's plot setting is in a quite distant future, in the dystopian 26th century. Pluto's plot is in the futuristic 21st century.
So, if you like Action, Sci-Fi, Seinen, you should read these.