Another option is to
Save your $2000
Spend around $1200 and get
StreetPilot 2610/2650 features
Powerful microprocessor for fast redraw and route calculation
Built-in patch antenna with an MCX-type connector for optional external GPS antenna
CompactFlash data card (type I or II) slot for map storage
Audio and visual navigation instructions and warnings
3.3" W x 1.7" H, 305 x 160 pixels; bright, automotive-grade 8-bit, 256 color LCD display with automatic dimming backlight and
touch screen
5.6" W x 3.2" H x 2.0" D unit dimensions
Alphanumeric remote control
Turn-by-turn automatic route generation
Indefinite data storage (no memory battery required)
Integrated dash mounting system provides easy adjustment and quick release
I have Garmin GPS V which costs $400.
That thing does a very good job navigating me around. Best thing - no lockout while driving. 8)