I am also in the same dilemma. I am planning to go with ICAS as well because of the same reasons that you wrote above. BTW Could you please answer some of my questions?
1) did you send two two separate documents to ICAS, one with the sealed HEC documents and other with your own application package or was it just one envelope with both (sealed one and your own applictaion) the documents.
2) I thought HEC will provide with their envelope. Don't they have any official one or will I have to take one with me for this purpose?
3) If yes then which kind of envelope would be better and acceptable basically?
I hope to courier the package tomorrow, provided this dharna allows.
God help our country.