Purchase Threshold Quesion
Let's say we'll have a battle and I'm an average mid-lane champion (Lux, Ori, Ziggs, Viktor etc.). I have 3000 gold and can buy a VS or I can buy Blasting Wand, NLR, Amp Tome and save up for another 800g to complete Rabadon's. Which would do the most damage immediately (let's say that a teamfight is imminent) and is it worth waiting for Rabadon's instead?