Lots and lots of variations. But basically get a $250-350 pair of speakers for a decent brand (Dali Spektor 1 or 2 are a good bet) and plug them into a $100-200 second hand amp and you've got a great set up. If you don't want to go second hand then Yamaha and Sony have some decent amps in this price range.
Spend whatever you have left over on a second hand CD player or DAC for your phone, depending on what you want to use as a source.
Spend whatever you have left over on a second hand CD player or DAC for your phone, depending on what you want to use as a source.