Thanks Michael,
I just created an irregular shape to make the the description more obvious. It is not an object i have any intention of using, although i had similar problems trying to mesh a similar shaped irregular object a few days ago and spent a while cleaning it up to make it a decent quad mesh for a c clark subdivision surface render test within xsi.

I have attached a sample model. Please let me know if you find any meshing settings or work-around for quad-meshing such curvatures.

Thanks