I'd suggest an Antec case along the lines of the P180, great build quality, great PSU. As for the HDD I'd personally go with two 320GB Seagates in a RAID 0 array, 320GB is the sweet spot right now and a RAID 0 array will really improve performance.
Both Asus and Intel make great boards and the Core 2 Duo is lightning fast, enjoy the cutting edge.
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