Your Best Tech Purchase?

What do you consider to be your best tech purchase? For me, it's a toss-up. The iPhone 3GS is, hands-down, the most influential gadget I've ever had; it catapulted me into the smartphone realm.

But the best, most useful piece of tech that I've purchased has to be my 2013 MacBook Air. Obviously, I'll have to wait a year or two to see if there's a rapid deterioration of battery life and performance, but as of now it's incredible. I use it on a day-to-day basis. I can carry it around in my backpack all day without feeling the weight and I don't need to worry about power outlets! Before my MBA I had a fairly beefed-up Samsung Series 7 Chronos, but even with the i7 and SSD the performance seems to pale in comparison to my MBA (i5/4gb ram). At first I thought the price was too steep for the specs ($899 after best buy sale and student discount), but I'm not complaining one bit!

So that's mine. What's yours?