[assohillA]

Fard obviously take top priority. However, its worth baring in mind that: A person who leaves out the Sunan-e-Muakkadah Salaah out of carelessness, or habitually leaves them out, is considered a Faasiq (open transgressor). The following ruling is written in Tahtaawi, "A person who leaves out Sunan-e-Muakkadah is a Faasiq, a person who denies it is an innovator, and it is stated in Talweeh that leaving it out is close to Haraam."
(Malfoozhaat Faqeehul Ummat, Vol. 1, Part 4, Pg. 16) http://www.muftisays.com/qa/question...nah-salah.html

A person only becomes sinful when he deliberately leaves out the Sunnat-e-Muakkadah continuously. If due to unavoidable circumstances he omits them once in a while, then he will not be regarded as sinful. (Shaami vol.2 pg.451; Multan). http://www.islam.tc/cgi-bin/askimam/...3513&act=print