My son had to make this exact decision last year. Yeah, Villanova has a great name, but at twice the price? What you study and what you get involved in while you are at school (ie; internships) has just as much of an impact on the job you will attain after graduation as the school you went to. Villanova will sadle you and/or your parents with a ton of loans and financial sacrefices. Is Udel giving you any merit $? Is Villanova? Remember you have to reapply every year for money from Villanova. I know quite a few kids who are there or graduated - none got any money after their first year.
I'm not knocking Villanova - it's a phenomenal school and I wish we could have afforded to send our son there. However, he has thoroughly enjoyed the challenge of the honor's classes and appreciates the extra attention to his academic needs that the honor's program offers. His only complaint about Udel is the dorms - and the food.
It's a really hard decision. I can tell you this, with nearly 3 times the students at Udel, there are now 3 times more alum. That's 3 times more the connections upon graduation!
Best of luck in your decision.