How Much Is My Computer Worth?

Hey guys, long time lurker, just finished my second build and was going to sell my first one. That being said, this is not an ad to attempt to sell my computer, I am just wanting to know the worth. I have read the threads that refer to a percentage of retail value, but as this computer was built in 2009, most of the items are discontinued, so I think you guys would best be able to give me a fair market value. Here are the specs:

GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128359

Intel Core 2 Duo E8500 Wolfdale 3.16GHz LGA 775 65W Dual-Core Processor BX80570E8500
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115036

COOLER MASTER NV 690 NV-690C-KWN2-GP Black SECC/ ABS ATX Mid Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119157

EVGA 512-P3-N871-AR GeForce 9800 GTX+ 512MB 256-bit DDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130339

Thermaltake Purepower W0100RU 500W ATX 12V 2.0 Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153052

Western Digital WD Blue WD6400AAKS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136218

Kingston HyperX T1 Series 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model KHX8500D2T1K2/4G
http://www.newegg.com/Product/Product.aspx?Item=N82E16820104098

ARCTIC Freezer 7 Pro Rev.2 with 92mm PWM Fan
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134

LG Black 6X BD-ROM 16X DVD-ROM 40X CD-ROM SATA Internal Blu-ray/HD DVD-ROM & 16X DVD±R DVD Burner Model GGC-H20L
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136133

Thanks in advance guys.