Here is a name that you didn’t know was in GPS business: Hitachi. They offer a couple of widescreen GPS navigation systems in Australia; namely the 4? MMP401, and the 5? MMP501 pictured above.
MMP501 offers AV IN connectivity so you can make use of the 5? anti glare screen in other ways such as watching DVDs. In addition it has bluetooth to pair with your bluetooth enabled phone allowing you to make and receive calls hands free. The GPS receiver on-board is SiRF Star III and the software offers fixed camera alerts and speed zone warnings as well as a detour memory. The battery is 2500mAh but we’re not sure how long it would last with a such a big screen.
MMP401 (pictured below) has pretty much the same set of features except that it has a 4? screen and the battery only has 900mAh capacity and it lacks bluetooth.
MMP501 costs 949AUD (840USD) and MMP401 costs 609AUD (540USD). But keep in mind Hitachi is preparing a second generation of sat nav systems (MMP501B and MMP401B) which will have a lower MSRP once they come out in mid-August.