Lieber Fritz,
Das sind alles gute Ratschlaege oben. I also would say to invest your money first say in good speakers. PCs, as Brulee has rightly pointed out, can make a tremendous difference and if you want to experiment, I suggest you try your preamp and/or your CD player first. Try the used market. I am sure you are familiar with wwww.highendmarkt.de, which carry lots of cables at fair prices. One caveat though, as has been rightly pointed out above, it needs a really high resolution system to hear the differences (good or bad) which PC's can make. Viel Glueck!
Das sind alles gute Ratschlaege oben. I also would say to invest your money first say in good speakers. PCs, as Brulee has rightly pointed out, can make a tremendous difference and if you want to experiment, I suggest you try your preamp and/or your CD player first. Try the used market. I am sure you are familiar with wwww.highendmarkt.de, which carry lots of cables at fair prices. One caveat though, as has been rightly pointed out above, it needs a really high resolution system to hear the differences (good or bad) which PC's can make. Viel Glueck!