Choosing between models is a decision; the model types are desktop and laptop, and the decision is personal, so the decision is for the consumer. There are multiple ways to do this and there may be better combinations but that should be grammatically correct
The soul selects her own society/then — shuts the door
No, it is generally not true that when summarizing the of a plot, that one should notice the key ideas about how the conflict builds, since plot summaries depend less on why conflicts occurred, and more on why they occurred.