I think that you need to takea little diff route for the problem. As it is better to have onein hand rather than 2 in bush, i will advise you toreap benefits of ongoing IT boom and go to US on H1.
In IIMs to get acall, you need toget 99.5 or above percentile and tht is quite a task.
I think best strategy for you will be to beinusfor more than 180 daysand get NRI status andthen get into any of the IIMs thru NRI seat bygiving GMAT. see this thread for infocon this and other topics in GMat forum
as per my knowledge all of the IIMs take students from NRI segment. further with more than 4 yrs of work ex, it willbe advisable to look atISB as well or try for US schools where loan or schol is available