Searching for GPS

I'm in the market for a GPS, and I've decided on Garmin. Specifically, I've decided on the 3 models 1350, 1390 and 1390T. You can roughly tell how high-end a GPS is by the screen size, and all 3 are 4.3" widescreens. The 1350 is a basic model with the lane guidance feature, which I think is quite important. The 1390 models are more advanced and have Bluetooth. The Garmin doesn't mention it, but this website says the only difference between the 2 is the T has the GTM25 traffic receiver.

These are the prices as of today, Boxing Day.
1350 - JB HiFi $198
1390 - Myer $224, Dick Smith and JB HiFi ~$270
1390T - Dick Smith $320

I would have (Why do people say would of? It doesn't sound remotely like have. They might as well say would ve!) bought it today, but they were all out of stock. I'm hoping for a better deal, and new maps next year.