I want to build my own computer,but right now i dont buy any thing on my list im comparing the price of every?

i want to build my own computer,but right now i dont buy any thing on my list im comparing the price of every component of my PC to buy.PLS SEND ME EMAIL if i mised something on my list main board;asus p5k chipset;intel p31/p35 processor;intel core dou e6550@2333mhz physical memmory;2048mb(2x1024DDR2-sdram) video card;nvidia corp ge force 8400gs or 8600gs hard disk;maxtor 250gb DVD-rom drive;tsst corp cd-dvdw sh-s202j ata device monitor type;m19w-19 inc network card; broadcom corp bcm4309 802.11 a/b/g o.s windows vista home prem. power sup;corsair 650w atx case midi...tv card haupaugewintv pci...do i need a sound card? and is atx case include c.fan and heatsink. im not much in to games but i also play.do u recomend any thing.fmt_kik@yahoo......thahnks