I went with the iPad Mini 2, not the current version, they are the same except the new one has the finger print scanner and comes in a gold color. If you can live without the bling then you can save some $, for the case or apple care. Another great way to buy is get the apple refurbished. Same warranty, factory reset, new cover/case. Not quite half off the new version, but almost.
I had originally been using the larger iPad, that the wife is now enjoying, and love love love the mini for what we do. It's light, easy to carry all day, fits easy into the briefcase. Very happy with it.
While there is a noticeable weight difference between the old larger iPad and the mini, the new iPad air and air 2 make that difference much less. The difference in $ is probably the only significant difference you'd notice.
I use the Lifeproof Nuud case. Google it. Waterproof, with no additional plastic film over the screen. I use it everyday in our weather and it gets wet all the time. No worries. It was one of the top 3 reasons why I chose ios over android for the device. Otherwise they are very similar in functionality.
One other consideration. If you intend to use voice dictation in the field on an iPad you'll need to be connected to a network or get the wifi + cellular model. Wifi only will require you to have a hot spot open, like your phone in your pocket or whatever for that feature. It is something to do with how Apple processes the Siri/speech to text. The cellular model also gives you GPS and connection for searching your MLS and update your ekey service in the field, again without fumbling for your hot spot connection.
Having had both, the $ hit for the cellular was worth it for me. Your mileage may vary. I would have likely been as happy with the new iPad air 2, so enjoy the process and once you pull the trigger, enjoy using the device. It really has made a significant difference in my work process.
