GDD, SLD, PDD?

My nearly four year old son is globally delayed, (25%+ in all areas).  He suffers from hypotnia and displays some PDD characteristics (hand flapping at times, obsessed with elevators, pronoun confusion).  He is extremely affectionate and sweet little boy.  He's had every test I can think of (genetic, audiological, MRI, etc.)  He's been in early intervention, receives therapies and attends a full day preschool disabled program.  He makes gradual progress in all areas, though is still "behind". Of course, like so many other parents in simiar situations, I'd love to know how to plan for the future.  His neurologist is not committed to any diagnosis as of yet, but is leaning toward mild PDDNOS.  His teacher thinks he has significant language/communication impairment.  My question is, should I seek out a comprehensive evaluation from a child heath center or just find peace in the fact that Brian is receiving all the therapies and education that he needs?  

[mjthewriterdad]

"   My question is, should I seek out a comprehensive evaluation from a child heath center or just find peace in the fact that Brian is receiving all the therapies and education that he needs?  "

At 4 years old, I think the second option is the best you can do at this time. It takes more observation.  It also depends on how long hisd neurologist has had him as a patient and / or how much of his past records he has and / or how much are in those past records.  I think at about 6 ot 7 years old, may be a more appropriate time for a more comprehensive evaluation (some may disagree, just my opinion).  The public school (USA federal law) re-evaluates all sp-ed children every 3 years.

It appears that you have a good early intervention program there.  About planning for the future, I kinda missed that one.  I felt that my daughter wasn't ever going to be able post high school education.  Then she gets into one of the most expensive art institutes in the nation!