I was gonna say how I only usually steal the Hardedge, but then I read through this list and I realise I steal the following on almost every playthrough:
Quote Originally Posted by Skyblade View Post
Hardedge from Soldier 3rds in Shinra Building
Carbon Bangles from Moth Slashers in Shinra Building.
Striking Staff from Eligor in train graveyard.
Grand Glove from the enemies that are swinging wrecking balls in the Mithril Mines (don't remember their names).
Boomerang from the Birds in the same forests you get Yuffie in.