Your grades are important..(straight A's from a state college vs. a C+ average from an Ivy League school?) Your extra curricular activities while in college, these say a lot about your social abilities. Your part-time work also says alot about you; being able to hold down a job while being a full time students takes energy and drive. Many employers and graduate school admissions deans understand the huge cost of private colleges today and would understand why a bright student might choose a less costly school over a prestigious one.
But the most important factor will be your personal references from your professors and your employers. Your work ethic, your character, how you treat other people, how you handle stress, your enthusiasm for your field of study, these are all independent of the school you attend.
As proof, google some famous people whom you admire and read about where they went to college...you might be surprised!
I hope this perspective helps.