I'll bite.

My first thought upon hearing this was: "Finally, I can buy a PC capable of running games at 1080p!". Sounds silly, but I've been having dreams about playing Skyrim and Fallout: New Vegas with a number of mods on (chief among them being the mod that allows for playing the games simulating the real-life first-person perspective instead of the fixed game-ish ones) and immersing myself into either hunting with a bow long-range or killing (and risking being killed) by a single bullet from an enemy, all the while struggling to survive and keep up with the character's needs.

After that, I'll go for something bigger. With that kind of money, I can live in Russia without a day of having to work for... I seem to have my calculations screwed up in some way, so let's vocalize that to see if I'm getting it right. $1.3 billion is, given current exchange rate (around 1:65), 84 500 000 000 rubles. Yep, that's 84.5 billion rubles alright. Given that I generally need 30k a month (including rent for a fairly decent apartment in Kemerovo or Tomsk), which is pretty cheap, I'll be able to live without a worry about money for... uh... 234+ thousand years. Somebody please check that.