EBB (and soon to be ACP) discount.

I have the ebb/acp plan and I had 20 gb plan and upgraded to 30gb. Before the new plans rolled out. I am just wondering what will happen if and when th ebb/acp quits. I was told that i would go back to the 20gb plan. But i am seeing you don't offer that any more. So would i go up to the 45gb plan or stay at 30gb and what would the new price be. thank you