500 GB WD Scorpio 5400 RPM 2.5" Laptop Drive - $56-$59 at Amazon or Newegg. (320G ~ $35)
This model is a great choice. I have the PATA version and its performed perfectly.
Here is the sata/ide/usb device I'm talking about. It's $19 on newegg, check around and you'll find it for less: http://www.newegg.com/Product/Product.aspx?Item=N82E16812816014
I have one of these, bought it 3 years ago, works great! Be aware if you have a usb1 or an early sata, they must be connected to a usb1 port, not usb2.
Is there a Fry's in NJ and PA? That would rock.
Kate