After recent Lowrance releases I'd be a bit wary of buying any of their new models. They seem to like testing the software on the customers rather than doing it before marketing them. Hopefully they've got this HDS lot right, but I'd be tempted to get one of last years models which has had the wrinkles sorted out on it.

If you can live with the Navonics only, the humminbird models are pretty reliable. I wish Hb would support lakemaster, so I could put my Dr Depth software straight onto the unit, as we don't have any mapping over here.