How much is my System worth?

Hi I am very new to this, Jsut would like other's opinion how much i can sell my PC for.

Well my PC was originally a Dell Inspiron 545mt with these specs-
Intel Core 2 duo E7400 (2.8 Ghz)
2 gb DDR2 RAM
Stock motherboard
Stock PUS(300 watts)
2x 120mm fans
250 GB HDD

I bought this 2 years ago and slowly i upgraded the RAM, GFX.
Then Recently the Mobo like Died in a hole.

So i upgraded the Whole Package
Intel core 2 Duo E7400 @ 3.4 GHz( Very easily overclockable to 4.0+ Ghz hehe i did it with my 300 watt PSU)
4096 Mb DDR3 Ram (1333Mhz)
AsRock g41m VS3 R2.0
Gainward 1024 Mb 9800gt Green Edition (75 watts Max. consumption)( also Overclocked
250GB + 500GB Seagate HDD's (7200RPM)
Thermaltake TR2 550 Watts 80+ bronze
Sound Blaster 5.1 Channel Sound Card(PCI )
DVD- RW drive
5 in 1 Card reader
Case- Dell Inspiron 545mt piano black
Windows 7 Home Premium

Acer Al1916 19inch wide (1440x900)
Juster SP-627 2.0 speakers
A4Qtech 1000Dpi 250Hz mouse
Dell Entertainment keyboard
( i just got Mx5500  )
Logitech Mic/ Webcam (2MP) USB port

Comes with -
Sony Vegas Pro 10
Microsoft Office 2010
Various other Softwares to help with the System

just wana know price of my PC( soon switchin to AMD)