Judging by your statements, you don't have particularly deep pockets. For this reason alone I wouldn't consider anyone but Canon.
A Pro has business needs completely different than an enthusiasts. Canon has a range of bodies and glass that far outstrips all competitors, allowing you to assemble a main kit AND a lessor but crucial secondary kit that will function as backup.
No other manufacturer compares in support and service to Canon. Can you afford to replace a broken camera or lens out of pocket on short notice so as to not miss a shoot? Nikon has a downright lousy reputation for their repair service, Canon are stellar in this regard and often generous in their warranty repair. Nikon isn't alone in mediocre performance, no one is in the same ballpark as Canon.
Join CPS, get a 2 day turnaround on your repairs, and never look back.
Totally agree with wtlloyd
! Great points!
Pros are (or should be if they're smart) much more frugal and pragmatic with their equipment purchases. The gear needs to be sufficient to satisfy the needs of the business and nothing more. (Where enthusiasts buy stuff because the want
it, a pro buys only what they truly need
.) Running a business is more about the balance sheet, not about the photographer. The photographer (whether it's you or an employee) is merely part of the business mechanism. The business of photography is more about marketing, sales, customer service/services offered and reputation. No one cares about the camera gear except the person holding it. And every item purchased, even if it's just a memory card, takes away from the profit of the business.
Good luck with your upcoming business venture! Just please realize it's a long, hard, slow process to profitability.