AThlon 64 FX-55 socket 939
http://www.newegg.com/app/ViewProductDesc.asp?description=19-103-496&depa=1
it's currently out of stock but it says it's going to be back at 12/15 so keep a close eye on it.
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MSI "K8N Neo2 Platinum" NVIDIA nForce3 ULTRA Chipset Motherboard For AMD Socket 939 CPU -RETAIL
http://www.newegg.com/app/ViewProductDesc.asp?description=13-130-468&depa=1
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EVGA nVIDIA GeForce 6800 GT Video Card With Free Doom 3Bundle, 256MB GDDR3, 256-Bit, TV-Out/DVI, 8X AGP, Model "256-A8-N349-AX" -RETAIL
http://www.newegg.com/app/ViewProductDesc.asp?description=14-130-208&depa=1
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Corsair XMS Extreme Memory Speed Series, (Twin Pack) 184 Pin 1GB(512MBx2) DDR PC-3200 - Retail
http://www.newegg.com/app/ViewProductDesc.asp?description=20-145-450&depa=1
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Pioneer Black DVD+RW/-RW Drive, Model DVR-108, OEM
http://www.newegg.com/app/ViewProductDesc.asp?description=27-129-157&depa=1
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If you want a heatsink fan get this
ZALMAN Copper CPU Cooler for Socket 775/478/754/939/940, Model "CNPS7700-CU" -RETAIL
http://www.newegg.com/app/ViewProductDesc.asp?description=35-118-115&depa=0
WARNING: VERY GOOD AND QUIET BUT VERY HEAVY. IF YOU GO TO A LOT OF LAN PARTIES, don't recommmend it because it's like 2 pounds and might rip off
If you want water cooling... um.. i'm not really good with liquid cooling so i might need some help on that
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2 x Western Digital Raptor 74GB 10,000RPM SATA Hard Drive, Model WD740GD, OEM Drive Only
http://www.newegg.com/app/ViewProductDesc.asp?description=22-144-160&depa=1
this is for speed because u said u do a lot of apps. if you want capacity, go with seagate 200gbs or more
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ViewSonic VE710b 17" LCD Monitor -RETAIL
http://www.newegg.com/app/ViewProductDesc.asp?description=24-116-314&depa=1
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This all sums to about 2.3 grand without case, keyboard, mouse. Those are all your choices on what you want to get. This isn't a perfect list so check out other people's recommendation