Thank you very much for your reply.
Regarding your 3rd option : MNL and the issue of IIA. If I do a Choice based conjoint and each time I ask my respondents to choose among the same choice set of brands (hence I am simplying changing the price and other attributes but the same 4 brands are always present in the choice set), then will my MNL suffer from this IIA?
Furthermore, How can I create an ortogonal design for my CBC? meaning, how do I know how to vary attributes levels between the tasks?
Thank you,
Fabio