Sudan parties' digest: complete break or partial separation?

separation(The Net NSV) - The post-referendum talks have formally started today.  I'm not going to bore you with all the details, but the SPLM and the NCP, the two partners to the CPA have been asked by former South African president and chairman of the African Union panel, to pick from the following options:

1. Creation of two countries which would negotiate a framework of co-operation in a confederal arrangement.

2. Two separate countries with soft borders that permit freedom of movement for both people and goods.

3. Total separation with citizens needing visas to cross the border.

4. Continued north-south unity if southerners choose that option.

Do you think southern Sudan should severe ties with the north, and pick option (3) or relax the border policy and pick option (2)?