What speakers with stock CD player

[Rattlin_Ram]

Ok so I have a 2001 2500 (in my sig) with a factory CD/Tape player. I'm not real big into spending tons of cash on audio. But my factory speakers sound like crap.... I don't believe I have the Infinity option, but I do have the tweeters in the pillars. It doesn't say Infinity anywhere. So anyway I have at least one rear speaker that doesn't work at all. And one 6x9 up front and one tweeter blown...

What would be good (cheap) replacement speakers? Looking at just some 6x9 3 way rockfords on ebay. Not sure what watt? And wondering what to replace the rears with? And should I replace the tweeters or just disconnect?

Any help much appreciated!