I think @
steve99 sums it up pretty well. But I am going to piggyback on what he is saying.
It comes down to budget and future plans. Which you may or may not know right now. There are other tuning methods, but the two listed above are the most common. Just to clarify in case your quite new to things.
You can use an OFT(openflashtablet) as your tuning choice.
Or, you can use Ecutek as your tuning choice.
Please research these thoroughly. Then think about any future plans for the car. This should help you make the choice. The only other consideration is your budget, and if you want the convenience of flexfuel (as opposed to map switching). I have experience with both OFT and Ecutek on several BRZs and on other platforms. They both work very well. However, at the moment I am running the exact setup you listed above. I will tell that i love it. The tune from Delicious is running great, and the flex fuel kit is fantastic. Its great when things work exactly as they are supposed too. I'm a happy customer. But i have a plan with my car, and i know the path i want to follow.
You should give that some thought as well. But, you cant go wrong with the setup you listed. It is rock solid, and if your dealing directly with Delicious then that is great for you. The pricing you mentioned looks spot on to me. Its the same price i paid, except i did the install myself. Which, if you have any interest of ever doing your own work. This flex fuel kit may be a nice one to start with.