Oh thats a lot, that is pretty hot if build from parts, of course if someone else build it he will take some money of that cake too.
Taken from
http://www.anandtech.com , something like this could be the right direction. Of course, the builder will come up with diffrent parts and might eaven be right about it, since he probably know what works and what he can get. Sometimes specific parts, specially those recommended in reviews are hard to get and other parts are better and cheaper.
The biggest problems, like that motherboard works with the RAM, cooler fits onto the board, parts are impossible to obtain and the like are not your porblems if you have someone else to build the stuff.
Processor Core 2 Duo E6600 $223 €203
Cooler Zalman CNPS 9500AT €39
Motherboard EVGA 122-CK-NF63-TR $159 €159
Memory OCZ Flex XLC 2GB Kit DDR2 PC2-6400 $179 €179
Video Card EVGA NVIDIA GeForce 8800GTS 640MB $350 €339
Hard Drive Samsung SpinPoint HD501LJ 500GB $112 €92
2nd Hard Drive Samsung SpinPoint HD501LJ 500GB $112 €92
Optical Drive Pioneer DVR-212BK $42 €47
Case Apevia Aspire X-Cruiser $59 €79
Power Supply Corsair CMPSU-620HX $126 -??
Sound Card Creative X-Fi XtremeGamer Fatal1ty Professional $140 €119
Operating System Windows XP Media Center Edition 2005 SP2B (OEM) $110 €104
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Parts total: €1582
Building, 24h break in, 24h service (for example): €300
System total: €1882
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Display Acer AL2216Wbd 22" 5ms 1680x1050 $250 €289
Alternative Motherboard: Asus Striker Extreme $305
Alternative Case: Antec Nine Hundred $110
Alternative Powersupply Zalman ZM600-HP (600W) $132 €111
Edit: I did not build this system, the parts are what anandtech suggested but i removed the second graphic card, added a second hard drive and the cpu cooler. 2 graphic boards in SLI does not make sense unless if you need it for work, to much heat and noise. On top of it it only makes sense if you get the fastest boards there is and then two of those, two mid range boards is not usefull.
The new intel chipset P35 seems pretty fast, might be an option to get a P35 DDR2 motherboard.