The amount of money that you need to have available to be approved a study permit doesn’t vary by the stream you opt for. All that changes is who holds the funds. For those who opt for the SDS the funds are held by a bank in the form of a GIC, and by the university, in the form of a transfer for the first year’s tuition. However those who opt for the regular stream (non-SDS) have to show that they have the same amount of liquid funds available.
The amount of funds doesn’t change. Just who holds them.
Irrespective of which stream you pick, a good Cover Letter, Education Strategy, Financial Support Letter, and comprehensive Financial Documentation are key to submitting an application that will be approved.