Don't Forget to Factor in Other Stuff to buy
You will need a camera connection kit ($29), a screen shield ($20), a carrying case (I have the Apple case, $39), and various apps. You are a writer? Apple offers an app for $9.99. Movies, TV programs, music, and books, all have $$ attached.
So far, I have spent around $1,300 (yikes!) But I bought a 64gig 3G iPad. I thought I would need that much capacity because I am a photographer and I wanted the iPad to display my finished photos. I bought the 3G version because I thought I would take advantage of gps--I live in northern Indiana and it is great to have gps when looking for shooting vistas. It is very difficult to find farms, landmarks, remote parklands and wild places without a gps capable iPad. It is also quite helpful helping you find your way home.
Another benefit of having gps is finding restaurants, gas stations, etc when out in the field.
As far as photography goes, most DLSR cameras produce 12mg files (on average). If you are a prolific shooter, you'll find yourself using more capacity on the iPad because it displays photos very well. You indicated you have children, put their pictures in an iPad and you'll have them fighting to manipulate their photos on the iPad. If your camera takes video, you'll want to use the iPad for sharing those videos on the iPad too.
I like The Apple Case BUT
There are many opinions to what is the best case to have for your iPad in the accessories part of this forum. Look at the thread that asks "Is it just me?" I like the case, it meets my needs. It does pick up dust, it is a very snug fitting case, and you can't have the iPad in this case and use the optional dock widget, the case is too thick and the dock part is too short to use. I have had to go back to using the original cable that came with the iPad--$39 lesson learned.
Once you decide what you want, if you order through Apple Stores, order your case and your camera connector with your order. Both case and camera connector are on back order and it takes a long time to get these options.
If you want to talk about your camera--that would constitute as being off topic! I recommend you to go to Digital Cameras: Digital Photography Review, News, Reviews, Forums, FAQ. There you'll an awful lot of camera gear talk.
I hope you will enjoy the iPad, having it in my life has made technology so much more accessible.