I will be having Original HTC Google Nexus One for sale soon from UK.

I need your advice on the current market price of the phone both New and Used ones.

Below is the specification and picture

Specifications:
General 2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 900 / 1700 / 2100
HSDPA 850 / 1900 / 2100 - for AT&T, Rogers Wireless
Body Dimensions 119 x 59.8 x 11.5 mm
Weight 130 g
- Touch-sensitive controls
Display Type AMOLED capacitive touchscreen, 16M colors
Size 480 x 800 pixels, 3.7 inches (~252 ppi pixel density)
Multitouch Yes
- Trackball navigation
Sound Alert types Vibration, MP3 ringtones
Loudspeaker Yes
3.5mm jack Yes
Memory Card slot microSD, up to 32GB
Internal 512MB RAM, 512MB ROM
Data GPRS Class 10 (4+1/3+2 slots), 32 - 48 kbps
EDGE Class 10, 236.8 kbps
Speed HSDPA 7.2 Mbps; HSUPA, 2 Mbps
WLAN Wi-Fi 802.11 a/b/g
Bluetooth Yes, v2.1 with A2DP
USB Yes, microUSB v2.0
Camera Primary 5 MP, 2560x1920 pixels, autofocus, LED flash, check quality
Features Geo-tagging
Video Yes, D1 (720x480 pixels)@min. 20fps
Secondary No
Features OS Android OS, v2.3
Chipset Qualcomm QSD8250 Snapdragon
CPU 1 GHz Scorpion
GPU Adreno 200
Sensors Accelerometer, proximity, compass
Messaging SMS(threaded view), MMS, Email, Push Email, IM
Browser HTML
Radio yes
GPS Yes, with A-GPS support
Java Yes, via Java MIDP emulator
- Active noise cancellation with dedicated microphone
- Dedicated search key
- Google Search, Maps, Gmail
- YouTube, Google Talk, Picasa integration
- MP3/eAAC+/WAV music player
- MP4/H.263/H.264 video player
- Voice memo

I need your advice on the current market price of the phone both New and Used ones.