Scooped Neckline: I won't try to copy the neckline on the inspiration dress. The NL neckline would have to stay pretty high in order to make this successful and I just don't think that's a flattering look. Butterick 5827 has a similar neckline, but the collar portion is too high.
Even though a v-neck will be more flattering, the general consensus is to stick with the scooped neck and lower it a couple more inches. I did a quick photoshop of the neckline from Simplicity 2648 and the NL pattern and I don't think it looks as good as the rounded one.
Black and white/cream: This is so happening!
Solid Back: Melody made a good point about sitting in something and having it show with a white/cream back. A solid black back leaves all of the interest in the front and will definitely be more slimming.
Double knit: This last minute consideration seems to be the best and most popular suggestion. I hadn't even thought of it until I looked at the details of the inspiration dress. The pattern calls for an invisible zipper, though I don't like using them in knits. I'll give it a try and see what happens.
Thank you all again for the advice! Now comes the task of making this work!