I think it will have to be Chopra and Sehwag.......These 2 were the reason for a great showing in Oz, and I don't think they should discard Chopra this quickly. He is an awsome fielder at bat-pad. He is the best that I have since the great Eknat Solkar......Yuvraj dropped a couple of sitters in the 3rd test against Pak, when Chopra was dropped and luckily it didn't prove too costly, but in India the bat-pad is a very important position, especially of Bhajji, when he is bowling well, so I think they should keep Chopra, if not for his batting, then keep him as a fielder and u get a very very good opening batsman...
Also another reason to keep him is that Sehwag feels very comfortable batting with him and it is very important that Sehwag is firing on all cylinders when Australia come to India and with Chopra and Sehwag they gave India great starts in all tests when they were in Oz....
Fianl Verdict: Yuvraj is still young, no doubt he will be a future test player, but at this moment there is no room for him in the middle-order, only one that could be dropped is Ganguly, but that won't happen as he is India's most successfull captain, and there is no point in changing the opening position, as after a long long time India has got a stable opening combination and it woould be stupid to try and change something that isn't broken!!!!