Spoiled brats or just well off?

as parents and future parents how do you manage/plan to draw the line between spoiling your children and providing what is best. My husband and I are in the process of planning and I keep getting feedback from family & friends saying my child will be a "spoiled brat" and I don't want to raise a paris hilton... help me know how to draw the line. To be quite frank financially we are EXTREMELY well off but we worked hard to get here...how do i instill those ethics in values in my child that my parents instilled in me. My mother in law suggested we have 2 or 3 kids b/c if we have one he/she will be a out of control...does multiple children help level things out? Just help me....