I like your camera choice! It still keeps the large sensor and the SD cards which should make your video look great. I also agree wholeheartedly with dellwovideo. Dolly shots go a long way in showing depth of objects and a high degree of professionalism. If you do plan on using a dolly, I would get a slider dolly that sits on a tripod for the most efficient filmmaking. You can actually build your own in order to get the cheapest price. Otherwise, a DIY tabletop dolly is also rather passable!
Again, I wish you the best in your realty video business! I think it's a wide open market to get into right now. Good luck!