Pediatrician: www.mypediatricassociates.com (We see Dr. Tiffany Spanier, and I absolutely ADORE her!...I'm not sure if they accept Group Death insurance or not, though...so you'd have to find out).
Dentist: www.redmondkidsdentistry.com (My 3 year old has been going to her since he was a year old...she is absolutely the BEST pediatric dentist)
As for OB/GYN's...I didn't see Overlake as one of your options, so I couldn't help ya there, since we use Overlake for everything. HOWEVER, I wonder, since Overlake and Group Death are merging their hospitals/emergency rooms, if that will be an option for you in the near future. If so, I highly recommend Overlake OB/GYN Associates...and I see Dr. Lawler there. He delivered my son, and several of my friend's kids...and he's highly knowledgeable with hormonal disorders (like my PCOS).
If, at some point, you are able to get a different insurance plan than Group Death...I would highly recommend that, as well. I'm sure if you talk to enough people, you'll hear some of their horrid stories...and I have plenty of my own. I would definitely go to network doctors/hospitals over the actual Group Death physicians when at all possible.
Best of luck!