I am a TOMTOM Fanatic. I just purchased my second TOMTOM 920T - integrated with auto trafic reports - so it identifies broadcast trafic delays and plans alternate routes - it has come down in price since they just came out with the 930T that has route modeling. Route modeling looks at peak trafic times and adjust fastest route by time of day to account for heavy trafic.
The UI on the 920T is huge, easy and very updatable. It connects to my mobile phone for gas pricing - which is very good at the current prices.
If you can find a 920T for less than $300 - go for it...