Subodh
I am confused about your statement that you are moving to EIGRP because OSPF does not support load balancing. OSPF does support load balancing (over equal metric paths). EIGRP does support load balancing over equal metric paths and can do load balancing over unequal metric paths using the variance command.
Both EIGRP and OSPF will support load balancing over external routes assuming that they see paths with equal metric and route type.
HTH
Rick
HTH
Rick