The links you posted don't work correctly, I have been a big fan of newegg.com and one thing you should have done rather than post here is read the user reviews for each item before you purchase it you can also do online chat with newegg or email for any questions you have they are always very very helpful.
If you could post new links or the products your looking at I sure many here will be happy to help
the second link you posted for an scsi hard drive is not compatible with the motherboard other than that everything looks good to me make sure to purchase any extra cooling fans and heat spreaders for the ram use 1 or 2 gb sticks and i wouldn't even bother with Windows Xp with this hardware I would get Window Vista Ultimate edition to make it a honest to goodness direct x 10.1 gameing rig on the other had check out these links and take all the work out of building your beast and let someone else do it check it out
http://ibuypower.com/mall/lobby.htm
Now that looks good I have the Nvidia 8500gt its great not to expensive either plays crysis and that's a challenge on some Motherboards, Good Luck to you
