After living on a tight budget for so long

we are FINALLY looking at a better car. We have the money in cash. The expedition we are looking at has a clean carfax and the dealer has a good rating with the BBB. We need the space as we don’t even fit in a minivan anymore. It is even below book value. I gets better gas milage than my rodeo too. Yet I feel uneasy. Anyone feel this way or am I extremely weird?