H4 to j1

Hi
My wife requires J1 visa to start her residency in July 2010. She is currently on H4(we still have 3 yrs left on that and I will be transferring H1 to a new employer in July).
She originally arrived in US on B1/B2 in April 2008,we married in US shortly after that and she changed status to H4.
Can you advice in this situation which is best step
1)Going to Canada for J1 stamping.
2)Going to India for J1 stamping(we fear rejection esp given the fact that she was given B visa from India in 2008 to take USMLE step 2CS,her visa stamp carried date and center of CS exam)
3) Change of status from H4 to J1 while remaining in US-Although may take long time seems most secure to make sure she stays in US and is able to save her residency provided the program can wait for her while COS processing is underway.
4)Also can you advice me if I have to request continuation of dependent H4 status for her when my H1b gets tranferred to new employer in June-July 2010.
We need urgent advice on this and preferable from competent immigration lawyer with experience in this field who we can retain to handle this case for us.
Thanks