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Chronicle Swaps:
6pc Majin Whisper: +10% to Berserk
6/9pc Sword Demon's Blessing: +10%/+20% to Berserk
6/9pc Magic Sword Knight: +5%/+10% Soaring Blades - Reinforce
Useful and easy to get single pieces:
Halidom: Glorious Chain Mail of Kers (level 60 halidom heavy top): +1 Berserk
High Tech Slayer Ring: +1 Berserk
Kazan's Curse: +2 Berserk
Magistrate: +2 Soaring Blades - Reinforce
Ancient Tome of Nobility: Demon Slayer: +1 Soaring Blades - Reinforce Upgrade
Superior Greenhorn Bruiser Upper Heavy Armor(600 stamp PVP top): +1 Soaring Blades - Reinforce
Sea God's Cursed Chain Leggings: +1 Berserk and Soaring Blades - Reinforce
Good but really hard to get pieces:
War God Upper Heavy Armor(18,600 stamp pvp top): +2 Berserk and Soaring Blades - Reinforce
Captain Trooper's Iron Armor Gaiters: +7% Berserk and Soaring Blades - Reinforce
Magic Cataclysm: +2 Soaring Blades - Reinforce
Heaven's Luck Sword: +2 Berserk and Soaring Blades - Reinforce
Various titles (i.e. Sweet Dreamer)
If you want to be really good at end game, you want a swap set for both buffs.
Edit: The current Legendary Olympus bead makes any belt a +1 to Berserk and Soaring Blades - Reinforce