I've been thinking about starting Full Metal Alchemist. I'm not really experienced with manga, having only watched Death Note up til episode 13some and reading the first 5some books.
you should definitely watch FMA!! it was one of the best anime/mangas ive ever seen. also, the anime and manga are really different because the anime ended before the manga did so you should check out both lol also, you should finish deathnote! another one of the best animes ive watch. though i never read the manga..
Fullmetal Alchemist is great- the manga and the animation. Sadly, the final volume of the manga doesn't come out until December. 
you can read everything online, its too bad they took down onemanga. by far the best site for scanlations
What's the summary (for the first one)?
wow i feel like such a dork for knowing so much about fma lol, anyway, this may be kinda spoilery :/
in the FMAverse, they can perform alchemy, but theres equivalent exchange something for something in return. then theres the philosophers stone, it can change metal to gold bring ppl back to life blahblahblah the usual stuff. and its about 2 brothers, called edward and alphonse elric (ed and al) and about how they tried to bring their mom back to life but failed and ed lost one of his arms and one of his legs in the process and how al lost his body and his soul is now confined to a metal suit of armor. the whole story focuses on how they try to find/make a philosophers stone to get their bodies back.