Yep u can also opt for Giagbyte K8NS-939 for arnd 6-6.5k. Although not based on the nf3 chipset, i wud also recommend chking out the MSI RS480 mobo.
Get Transcend since it is know to be a better oc'er than the KVR.
HDD - Seagate
Cabinet - Get any generic cabby, but make sure that it has enough case fans or provisions to add in more. If u have moolah to spend get the Antec SLK1650 with 350W PSU for little less than 3k.
Speaker - Altec Lamsing 251 or VS3151 (Recommendations for the VS3151 by suave_guy
)
DVD Writer - Benq 1620 Awesome writer for that price.
Also i'd suggest that you get the MSI RS480 board and a PCi-express 6600GT (priced same as the agp version) So that you wil be future safe so to speak.