joyjoy, u don't have dot on keyboard ?xD
anyway - for sound purposes - only stereo passive high quality speakers with decent amp.
about ram - you seriously think someone would use 32bit system nowadays on new PC? xD
gpu - crossfire or SLI is for enthusiasts. whats the point of taking two cards while u can buy one, 3x better than 2 weaker ones? and avoid mass problems. Best single cards costs like 600-700 euros. There is no possibility to buy 2x cards (in same price <700 euro) to have better performance than a best single one.
cpu - imo go for sandy bridge 2600. those i7 9xx are waste of money.
mobo - any with p67 chipset will do.