If you are OK with carrying a rather large device whose operating time on battery may not be much more than an hour, then any of the current models will suffice. When away from home, I carry one or the other of my handhelds - usually my Oregon 450 - onto which I will have loaded OSM (Open Street Maps) map(s) of the area before I leave home.
The advantage of the handheld units is that they are waterproof and a good bit more rugged than any of the automotive units.
If you think you're going to be OK with the larger 1 hour device, we should discuss what other features might be important to you. "Pinch to zoom" (sounds like you're really after a capacitive screen where your fingers can do some useful work in other ways as well) is part of the current GO x00 series. The GO 400 isn't being sold in North America, so the next size up is the 5" screen GO 500. One of the other benefits of that model will be Live traffic while you are at home IF you have a smart phone with a data plan. The data used by the GO for traffic isn't much and shouldn't hammer your data plan. The two tie together by Bluetooth using an App for the phone that TomTom provides. They have both Apple and Android versions. You don't say what model you used to own, but if it predates the old GO 740, you will not have had any experience with Live traffic before. In the Houston metro area, it works quite well, and heaven knows there's plenty of traffic there to worry over. These devices will route you around it for best possible time if that's how you've configured them.
