Toshiba Laptop Resale Value

I have this laptop a Toshiba Satellite Pro L300 1AF:http://ie.computers.toshiba-europe.com/innovation/jsp/SUPPORTSECTION/discontinuedProductPage.do?service=IE&BV_UseBVCookie=yes&PRODUCT_ID=1058007#0

And I've had it for nearly 2 years and I've upgraded the memory to the maximum allowed of 4gb and I replaced the HDD with a Western Digital 320GB 2.5" Hard Drive SATAII 7200rpm 16MB Cache - OEM Scorpio Black I've also put Windows 7 Ultimate on it and I was wondering what would its current value be. Its in excellent condition.

I think I paid €550 two years ago.

The Original Specs:

Processor: Intel Pentium dual-core processor T3200 2GHz
Memory: 1GB DDR2
HD Capacity: 120GB
Display: 15.4" WXGA
Graphics Card: Intel GMA 4500M
Operating System: Windows Home Premium
Optical Drive: DVD-SM Super Multi
Networking: Wireless WLAN 802.11b/g / Gigabit Ethernet LAN / 56Kbps V.92 Modem
Warranty: 1 Year Manufacturer Warranty
Interfaces:
1 x DC-in
1 x external monitor
1 x RJ-11
1 x RJ-45
1 x external microphone
1 x headphone (stereo)
3 (Left 2, Right 1) x USB 2.0