Keep in mind that there are many tax tricks you can play here too, like paying yourself dividends and writing off a lot of expenses (speak to an accountant before doing so).
Also the overhead of running a corporation (including lawyer, accountant, payroll, and general insurance) is not much if you're making over $100/hr. It is certainly less than 26.7% (ie, $75 of every $175 minus 15.3%) worth. Most of these costs are fixed, not variable.
my wife is a cpa/cfp, and this is how i set up my company. i write off most stuff (car, office supplies, computer equip, internet, phone, etc), and pay out yearly dividends on top of a base salary. for a one-man corporation, the overhead can be really minimal. if you can get health benefits from your spouse and keep nearly 40 hrs week in billable hours, you'll never look back.
Also the overhead of running a corporation (including lawyer, accountant, payroll, and general insurance) is not much if you're making over $100/hr. It is certainly less than 26.7% (ie, $75 of every $175 minus 15.3%) worth. Most of these costs are fixed, not variable.