I've been eyeing this (against TOMTOM Go 520 too) from The Good Guys and Bing Lee for its 20% off eBay deal for a few weeks now, for a Christmas present for someone getting his P.
The Lowest price it has been so far according to a few pricehipster searches.
Brief spec from official product website: (While the website doesn't mention, but the screen is importantly and thankfully capacitive)
DISPLAY SIZE 4.8”W x 2.7”H (12.1 x 6.8 cm); 5.5” (13.9 cm)
DISPLAY RESOLUTION 1200 x 720 pixels
DISPLAY TYPE multi-touch, glass, HD color TFT with white backlightWEIGHT 5.31 oz (150.5 g)
BATTERY rechargeable lithium-ion
BATTERY LIFE up to 1 hourPRELOADED STREET MAPS (INCLUDES MAP UPDATES)
DATA CARDS microSD™ card (not included)
3-D BUILDINGS AND TERRAINVOICE-ACTIVATED NAVIGATION (OPERATE DEVICE WITH SPOKEN COMMANDS)
LANE ASSIST WITH JUNCTION VIEW (DISPLAYS JUNCTION SIGNS)
BLUETOOTH® CALLING
SPEED LIMIT INDICATOR (DISPLAYS SPEED LIMIT FOR MOST MAJOR ROADS IN THE U.S. AND EUROPE)
DRIVER ALERTS FOR SHARP CURVES, SCHOOL ZONES, RED LIGHT AND SPEED CAMERA WARNINGS AND MORESMART NOTIFICATIONS VIA APP
WI-FI® MAP AND SOFTWARE UPDATES
ACCESS TO LIVE SERVICES VIA APP
No offence, just being honest, but someone on their P's almost certainly has a smart phone capable of doing the same thing for free. Maybe look into buying them a good phone mount with a charging kit etc?