They do take BCBS PPO, that's the type of plan that I have, too. I would give them a call, let them know you'll have BCBS after July 1st and get scheduled for a consultation.
When you have your consult, the doc will discuss the options with you (lap band or gastric bypass) tell you the pros/cons and give you their suggestion for what would be best for you. It's a very informative session and the docs there are great. They have been doing these surgeries for years and years. Dr. Peters just got named Head of Bariatric Surgery at Christiana and he assisted Dr. Irgau on my surgery. The docs always assist each other for every surgery -- you really get double your money's worth, two very experienced doctors working on you together.
Dr. Irgau did me, my mom four years ago, and my Aunt on May 1st. There are a lot of people who come up from downstate and go through this group.
Here is their website....
Welcome to CHRIAS - Christiana Institute of Advanced Surgery
They are having information seminars on June 6 and June 20 according to the web page, you might want to go to one -- I believe they are free of charge, too.
Feel free to contact me if I can help with any other questions you might have! :)