I'm a frequent and rather successful Kassadin player and tried lots of variations on starting a game with him.
I have come to the opinion, that the best starting Item is a Mana Crystal. (+2 health potions or 1 health, 1 mana, your choice)
Let me give you some reasons and thoughts: The extra mana is nice to have in the beginning, and allows you to harass a bit, but I DONT RECOMMEND that. The smartest move is last hitting melee when possible and with Sphere if necessary. If you play thoughtful, you can stay in lane until you have 925 gold. At this point i blue pill to base, get Catalyst and use teleport to go back to lane instantly (important on mid, not so important on sidelane).
(Most of the time i stay longer and get basic boots as well)
That thingy is amazing, and makes you last that much longer in lane, got me a few kills by level-up in the right moment, too
Something on Tear of the Goddess: yeah, its a bad starting item, but it becomes viable after catalyst and boots IF YOU ARE NOT DOING PARTICULARLY WELL! you should build it into Archangels ASAP.
In some games it becomes clear after a few minutes that you are gonna kill someone. Get Mejais then, by all means.
so my basic build order is : mana crystal -> catalyst + boots of speed -> mejais OR tear -> archangels
after that i like to get either rabadons or Lichbane, depending on my current playstyle and the enemy team composition.
I hope this is helpful. Add me ingame if youd like to play some Kassadin practice against me ^^: "Ascaroth Ironass"
PS: something about summoner spells: ever considered Cleanse + Teleport? saved my ass so many times ^^
Edited by maxupp, 01 February 2011 - 01:06 PM.