$5,000 a month is a below-average salary for Software employees in many parts of North America. You will risk missing out on talent because of this - I know you don't want to get people who are only interested in money, but that's what an interview process is for.

A tiered system might work out better, where similar jobs are paid at a similar level (IE: all marketing get X, all software get Y, all HR get Z). Not all positions are created equal, and paying everyone the same amount (regardless of position) can lead to friction.

Just some thoughts! I don't mean to rain on your parade. Best of luck in your new endeavor!