I registered at Curascript, but went with CVS/Caremark -- both of these places are in-network PPO for Blue Shield here in California.
I was sorely disappointed and unhappy with the service from CVS/Caremark.
I've had good service from Precision Specialy Rx Solutions. FWIW...
Some insurance companies that provide coverage for treatment specify where the meds are obtained. Since the full course of meds is an expensive proposition they have deals with mail-order pharmacies for cost control. Some, like Aetna, have their own pharmacies. So, if you are starting treatment soon (think you said you were) one of the major tasks is to iron out the process for getting the meds. Once you have the prescription you should get in touch with your insurer (and their prescrition component) to see if they have any special med/rx requirements and/or rules you need to play by. A following step is to clearly understand the refill process since the meds may be supplied in one-month increments and you never want to to run out of your supply. A little more footwork may be in order.