[Hocrest]

TiOx Window - Any GPS I've used in the SVX, has taken longer to get the initial signal (1 minute instead of 15 seconds) but once it gets the satellite signals it maintains an accurate position. So you don't need a trunk mounted antenna

Which GPS - In my opinion the key features are; Big Screen, Free Lifetime map updates.

Power - Yeah, most battery's are only for a few hours. Generally I just always use the power cord.