HP - 13" entertainment laptop, must go

I'm selling my 13.3" HP laptop (model: dv3t). I bought it new for over $1500, and selling it for only $580. If that's too much, please make me an offer cause I gotta get rid of this thing. I'm trying to buy laptop with a bigger screen so I can do more video editing.

I've had it for about a year and a half. If you buy it, I'll throw in a 1 terabyte external hard drive for free.

It's a very, very good computer (check out the specs below). I'm selling it with the extended battery. It has normal wear and tear but no marks or scratches on the screen. Occasionally it overheats, but generally it is all good even on a non-flat surface. It comes with the power cord, of course. Come take a look at it--I'm on campus, and I'm selling it as is.

Specs:
2.54 ghz Core 2 Duo Processor (P8700)
4 GB RAM
500 GB Hard Drive (7200 RPM!)
512MB Dedicated Graphics NVIDIA GeForce G 105M
Backlit keyboard
Built-in Fingerprint reader
Built-in Webcam & Mic
Built-in 802.11n wifi
Built-in Bluetooth
DVD-RW Drive
Touch-sensitive volume control above keyboard

Ports:
3 USB Ports
HDMI out
VGA out
ethernet
eSATA