Ooh, as an owner operator that changes the situation a little. GMAN gave good advice on that aspect.
I seriously doubt that you will clear $100,000 if you only gross $140,000 to $200,000 and taking fuel, truck payment, insurance, maintenance, misc expenses, taxes and such out of that. For leasing to a company like those a better estimate would be 25% to 35% of your gross. If you are really sharp and have good luck you could do better. If you aren't a business person it may be better to stay a company driver.
A good tool to use is the ooida cost per mile spreadsheet available at:
http://ooida.com/trucking_tools/CPM/cost_per_mile.htm
to figure your costs and such. There is a lot of information available on this forum in the Owner Operator section about how to estimate costs.