The payout on the $1.3 billion prize, if won by an individual, and taken as a lump sum one time thing is somewhere north of $400 million. No gripes about the big bad government taking the $700 million in taxes since the work involved in winning it was just plain dumb luck.
That being said, family and friends would be taken care of immediately.
I would then take half of the remaining money and become an anonymous philanthropist, chairing any number of charities which in and of itself would be a full-time, noble, worthy occupation.
Then its a mad blur of purchasing houses, automobiles, socks, candy, and solar powered inflatable zeppelins.
As for audio gear, allow me to paraphrase Ralph Kramden...
"just think how great all this will sound in a Park Avenue apartment, Alice!"