I'm curious about the viability of Guinsoo's Rageblade, and Hextech Gunblade on Lee Sin. My reasoning behind this is thus:

Hextech Gunblade:
-Active ability has good synergy with Lee's Cripple, no one will be outrunning you.
-Used in conjunction with Iron Will (level 5) you will have 50% lifesteal, and spell vamp (64% lifesteal if you bought your Wriggles, like a good little monk)
-AD/AP hybrid items hold decent synergy w/ Lee Sin, it helps scale your damage abilities while helping your shield not be balls terrible.

Guinsoo's Rageblade:
-The passive ramps up faster than you might think, and the extra buff it gives to your shield can save your butt when escaping.
-AD/AP hybrid items hold decent synergy w/ Lee Sin, it helps scale your damage abilities while helping your shield not be balls terrible.

Only W scales from the AP so I feel it would rather be quite useless because he is like Renekton with AD skill damage mostly.

Hextech could be interesting for the slow...