I did not post the link initially, cray posted it and you are correct. The unit in the link is the 7X. I thought that was a really low price for the HDI, I think it is about $100 more than the 7X, but with new models coming out you might can pick one up at a deal.

The Elite 7X HDI does not have GPS(chartplotter).

The Elite 7 HDI has GPS, DI and 2D. When they introduced this unit it had problems processing the Navionics chip which gives you much greater chart and mapping detail. They have since resolved this issue, so I understand. If you go with this unit I would talk in person with Brian or whoever you buy from to insure the unit has the latest upgrade in it.
That said, for the price BBG has it listed, it has a lot of features for the money, which is why I bought it in the first place. I wanted a unit that had both DI and 2D so I could have the 2D available while I got used to using the DI. I still run both though.