haven't heard of that motherboard.
the Athlon 64's with a 1600FSB are actually socket 754. if you can, go for a socket 939. and look for a Venice.
the 6800 GT is a really good card.
remove the SB live, the onboard sound can be just as good, if not better, on a lot of boards.
go for the Abit AV8 at a minimum. the Abit AV8 is an AGP motherboard. if you want to go PCI-E (I would recommend doing so, for upgradability) I would suggest the MSI K8N Neo4. that has 7.1 sound, so you won't need a seperate sound card, even for surround speakers.
if you want to overclock highly, then go for the DFI NF4 Ultra-D motherboard. it also has 7.1 sound.
for the RAM, I would suggest either G.Skill with Samsung TCCD's if you're overclocking. or if not, then go for Mushkin or PQI. get 2x512 sticks, as they wil run in dual channel, and it is less expensive than 1x1GB
either go for a Seagate or Western Digital hard drive. they are really reliable. I personally prefer Seagate.
all the parts should be on newegg.com for less than what you've got listed