Long Sword

SWORD!

Can be upgraded in:
Hexdrinker (useful for AD, that fight vs mages, can be upgraded into anti-mage item[useful for trynda, that fights vs mages]).
Last Whisper (useful to penetrate tanks).
Madred's Razors (useful for junglers, can be upgraded in perfect jungle item, that allow to fast kill baron or dragon, buffs).
Manamune (mana+dmg, tear effect. Useful for Urgot).
Phage (standard fighter item, can be upgraded in Frozen Mallet or Trinity force).
Sword of the Occult (snowball item[more kills=more bonuses], useful, if you playing very well).
The Brutalizer (useful item in game start [nice dmg, nice penetration {only early game}, cd reduction], can be upgraded into Yomumu, useful upgrade of this item)
Tiamat (only 1 item in game, that give splash to your attacks [range champs=35%, melee=50%], this bonuses stack, also gives survilability).
Lightbringer (Dominion item, that gives nice attack speed, and gives vision of your target)

Sword, long sword.