My dress shoes for work are all over $150 each but I wear them every day and they have to be comfortable. I don't think for an interview for an RN position that you should spend that kind of money on the shoes unless you KNOW you will wear them again. I also agree that silver shoes are not appropriate for an interview. They would be great if you can wear that suit to a Christmas party or something in the future though. I would buy some simple, neutral pumps to go with the suit and if you get the job, splurge on the silver shoes.