Garbage in, garbage out. You cannot fix poor signals downstream. As a rule of thumb, add up what you'd spend on a CD player, tuner, turntable, and tape deck. Whatever that amount is, should be about what you'd spend on the speakers. A balanced system sounds far more musical and enjoyable than having too much invested in source, speakers, or amplification. 30% on source components, 30% on amplifier and preamplifier, 30% on speakers, 10% on wire (interconnect, power cords, speaker wire).
If you have a total of $5k and don't care for analog then you'd spend roughly $1500 on a CD player and tuner, $1500 on amp/preamp (maybe an integrated?), $1500 on speakers (including stands if they're not floorstanders) and $500 on all the wires you need.
If you have a total of $5k and don't care for analog then you'd spend roughly $1500 on a CD player and tuner, $1500 on amp/preamp (maybe an integrated?), $1500 on speakers (including stands if they're not floorstanders) and $500 on all the wires you need.