Nice build, I started off my first game with two dorians, it does well if you're not getting pressured to do too much damage.

Just a point I'd like to note on the mastery choice though, 'Expanded Mind' will only increase your base mana, at lvl 18, you have 975, meaing the most you gain from these 4 points is an additional 195 Mana. The XP boost just seems better on every class (aside from ryze as overload increases his base.)

Overall nice guide though.

While the double dorans rings sound effective, that is over 900 gold that goes nowhere end game. I've never played kayle, so I don't know how critical these items really are, but it seems to me you could go for something else early game that will build into a late game item. Also, for your runes, I would go with a glyph of clarity over replenishment. Yes, replenishment will give you a greater starting boost, but clarity will surpass replenish when you hit lvl 6 and since you don't plan to be right in the fight right off the bat I think it's a better choice. I'd also drop a point out of sorcery and put it into alacrity, I think the 1% attack speed is going to help you more than .75% cdr at this point.