Thus far:
VIA Epia M10000 - $110
256mb ultra low profile ram - $40
Hitachi 80GB 5400 RPM - $100
2.5-EIDE adapter - $10 (bought one for $5 on the forums and never received it, so $15 total

).
Casetronic 60w - $37
ITPS - $20
7" Xenarc VGA Touchscreen - $285
Illuminated keyboard - $43
Griffin Powermate - $36
Kenwood KAC-8402 60wx4 RMS amp - $110
C134 case - $100 (Arrived missing PSU, cables, cd-rom cover)
8x slim DVD-rom drive w/ adapter - $25
2x high-quality 3.5mm to RCA cables - $14
2x rounded superslim ATA-133 cables - $10
Cliffnet serial cable - $35
Fabrication suplies + wiring, connectors, project box, fans, misc - $100+
Related purchases:
Air horns + pain sirens for security system - $40
Digital tilt sensor + glass breakage sensor - $40
Pulse Timer Relay - $25
Self-powered siren - $45
Hood lock - $50
Remote start programmable temperature timer accessory- $40
Total: $1320
Still needed:
USB GPS -$45 est
1BG Sandisk Extreme III CF - $90 est
CF-EIDE adapter - $15 est
Wireless card - $50 est.
Optima Yellowtop - $125 est
Fused distribution block - $30-75 est
Better amp wiring - $25 est