I just built a 30x40x10 pole building last month. I researched the **** out of these pole building companies just as you are now. I looked at Pioneer Pole building, Morton, Lester, GaryBrown, Anthem steel, etc....
I actually found the very best deal at my local lumber company ( Berlin Lumber in Pa.) They use the exact meatl and building plans as these specialized companies and I saved about $2,500 on the material. They are also alot cheaper if you are planning on adding options like overhangs and wainscoting. I then hired a local crew to erect the building. All together I saved about $3,300.
84 Lumber was very competitive also. Maybe you can check your local lumber yard also.