I am comfortable with that salary range. Be truthful about your current salary, if asked. I'm confident that if you want to hire me, you will be fair with an offer. You should indicate your interest if it is truly a position you are excited about. Last, always send a follow up thank you note within 24 hours of the interview.
Email is an acceptable and preferred way to send a follow up in today's business world.
Thanks so much for your time and interest.