I would suggest nothing else matters, by Mettalica, I love the song, but even if you dont, its a good song to learn, its not all that hard, and it will open up doors, its a song you can learn a few handy things with, without it driving you nuts,
another one I would recomend, depending on your skill level is crazy train, by Ozzy, after you learn to play this, and it will take a while, you will be on the right road to learning alot cooler stuff,
and another song that will teach you alot, may not be ready for this one yet, depending on what cords,ect. you are comfy with is Stair way to heven, everyone who plays has to learn this one, its mandatory or something,

these are a few that will definatly chalenge you, but they are definatly in reach for someone whos been playing for a year, but the first step is finding a good tab.
Ill sift through some of my tabs, and pick out a few things that are a little easier, may take a day or two but Ill find some stuff for ya.