I'd say that at this moment, your speakers are priority, since the previous ones are blown.

Then (later on) start saving for a integrated or a receiver. Since I assume you won't have a huge budget for an integrated or a receiver (say $300-400, like with your speakers), you could get a denon receiver in this price range (say, a DRA-37, DRA-297 or maybe a DRA-397). Maybe you could even get a Rotel integrated (an RA-04) but you won't have a remote with the rotel. anyhow, both the denon as the Rotel will be a huge step up from the sony you have.

As long as the discman works, you should keep it until you have enough money (say $250) or so and buy a cd player. for $250, options for a cd player are pretty much limited, but you could get a Marantz CD-5001 then, and you shouldn't worry later on, since it won't be an upgrade until you get a rega or so (which cost, too much...)

Happy hunting
Bert.