I think the Indians would be shooting themselves in the foot in the long term if they go the American route. Why ? Simple, each administration has its own view of what balance of power in the region should be like. Plus, the Indians would be wise to learn from Pakistan, as in their F-16's embargo. The reason the Indians have had such good luck with the British is due to the little know fact that when SEPECAT and specifically the British were trying to sell the Jaguar to India, the Indians quite rightfully questioned the possibility of sanctions, which is when British Prmie Minister James Callaghan gave his unequivocal commitment that Britain would never again impose any sanctions on India in the future.
Can the U.S say the same even for the sale of aircraft ? Doubt it and since the purchase is going to be a substantial one India would be foolish to go that route.
Sadly, though the EF-2000 is definetly a forgone conclusion (out) cost and complexity is probably the biggest factor .