Visa question

Any current international students had gone through same situation ??

My 5yrs of H1B will be expiring in Aug 2009 and i will have 1 more yr remaining. I am planning to resign my job in July and attend Full time MBA program. My current employer had filed GC labor last November 2007 and its still pending. Now once i complete my MBA, since i have only 1 yr left to file my H1B and new GC ( and GC should be filed a year before i get 7th year extension on H1B) is it tough to find employer to sponsor both my h1b and GC at the time of job recruitment??

On top of all these, i did my MS here and used 3 months of CPT (for Intern) and 4 months of OPT.
Can i still apply for Intern during my MBA and use the remaining 8 months of my OPT after MBA?? Or is it like if i use it once i can't use it any more??