I need to draw house plans
 

Is OmniGraffle the right program for me or is there something better for my needs?

I want to draw plans for a home. I would like several layers for each type of construction (foundation, electrical, plumbing, gas, lighting, irrigation, etc.) plus I would like to start by defining the lot which is called out in the parcel map as having 14 different angled lines which sit at their designated orientations from N. I would also like to indicate grading, slopes, and elevations as the lot has over 150' of elevation across its 2.66 acres.