My manga collection is really weak at the moment as I've just gotten into buying manga, instead of just borrowing it/reading online:
Full Metal Alchemist Volume 1 and 2 (I refuse to read any more until I own them physically, so I'm gonna buy them up soon)
Scott Pilgrim Volume 1 (if you count that)
Phoenix Wright Official Casebook Volume 1 and 2
The Legend of Zelda A Link To The Past
The Legend of Zelda Ocarina of Time Part 1 and 2
Full Metal Alchemist Volume 1 and 2 (I refuse to read any more until I own them physically, so I'm gonna buy them up soon)
Scott Pilgrim Volume 1 (if you count that)
Phoenix Wright Official Casebook Volume 1 and 2
The Legend of Zelda A Link To The Past
The Legend of Zelda Ocarina of Time Part 1 and 2