I make a moderate amount of money from event photography and weddings, and a decent bit from selling calendars at the end of the year.
I currently shoot with a 6D, 24-70 and 70-200 F2.8's and (50mm), and generally borrow a low end rebel body from friends when doing wedding etc.
Although it won't make me any money, wildlife and sport photography is something I'd really like to start doing.
It's about time I get a second body instead of borrowing one all the time, and am looking at two set ups.
Buy a 5dm3 to supplement my 6D for events, and get a 7Dmk2 to play around with for some wildlife stuff. Those two bodies together will be about $6.5k here in New Zealand which lead me to my second option, just get at 1Dx for around $7.4k.
Both options have some pro's and cons, 1Dx for example has slightly better high ISO then the 5d, and most likely will be a lot better then the 7d in terms of IQ.
Getting the 5d and 7d however, the 7d has better auto focusing system, and some new features that aren't present on the 1Dx, and together their about $1k cheaper. The 7d also has more reach then the 1dx for wildlife.
I'm also going to be getting some new glass either way, probably a Canon 16-35 F4, and the Sigma 120-300 f2.8 Sport.