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Kassadin Build Guide by iAttackThings
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These items on the build are just the core main thing, but, of course there are situational items as well.
Mejai's Soulstealer (If you're confident that you can own the other team)
Abyssal Scepter (If you have a caster on the enemy team, like Karthus)
Void Staff (If they are building MR)
Haunting Guise (If you need a little more health and AP, as well as the Magic Pen)
Banshee's Veil (If the enemy team is full of casters like Veigar, Karthus, Brand)
That's really about it. I just made this quickly and I will edit it more to become a full guide depending on the feedback. Good luck, have fun!