The decision for or against graduate school depends on what you want to do. Those who want to work in the field usually go straight to work with a bachelor’s or a master’s degree; most of the engineers I know have bachelor’s degrees, including the recent new hires. (IOW: the hiring situation differs by region, from year to year, and depending on the candidate’s flexibility with regards to location.) Those who stay on for a doctorate are usually going for careers in industrial research or university-level teaching and research. The same is true in fields such as nursing and physical therapy, although some fields are bumping up to a master’s requirement for in-the-field new hires. That will be something that could easily be different six years or so from now than it is today; your departmental counselor can give you that information when you get to your junior year of college or so.
As for Benedictine, my caution would be to have a plan for what to do if the entry scholarship package drops off in the second year. This kind of “bait-and-switch” is the bane of private-university students, and it is not at all uncommon. Your advice about not accumulating a lot of debt is well-taken, though. It is hard to start a marriage and family with a mountain of debt to service, and seminaries do not want candidates with a load of unpaid student loans. There is a great deal of freedom to be had in freedom from debt!! There are public universities, meanwhile, who have such strong ties between their students and good Catholic parishes or Newman centers that on-going formation as a Catholic can be achieved very well at one of them. On top of that, we have had difficult stories here concerning high school students who were not accepted into the college of their choice and who had no fall-back plan for that event. So yes, it is worthwhile to research more than one college only. I would say it is a necessity to include more than one first-tier choice and at least one excellent no-matter-what-happens choice (in order to not be stuck with an “I-can’t-believe-I-got-stuck-going-here” no-matter-what-happens-choice, let alone an involuntary “gap year” that does nothing to advance your development as a person.)
Consider it fire insurance. Maybe it would be the worst day ever if you have to use it, but your worst day ever will be immeasurably worse if you don’t have your contingency plan ready before that awful day comes.