Three weeks from Saturday I leave for the UK on an 8-day business trip. While there I'll be renting a car and doing a substantial amount of driving: London to Exeter, Exeter to Liverpool, Liverpool to Hull, Hull to London. I'll be renting a car from Hertz which offers their NeverLost turn-by-turn voice guided GPS for an additional $98 for the week I'm there. However, I'll have my iPhone 3GS with me and be activating the Int'l Voice and Data packages. So what does everyone think...spend the $98 for the NeverLost or just go with the iPhone?