If you are "doing jobs", I assume you are getting paid. If that's the case, you really should have a second body so that you never leave a customer in the lurch if your camera breaks.
However, it you only have the one lens, you are also hurtin' there. It's kinda hard to justify two cameras with only one lens between them.
So I'd definitely suggest getting the lowest cost camera possible - a second 60D would probably be the best compromise - and putting some money into lenses... a wide or moderate zoom at least.
Can't even start to suggest lenses, and really can't say what camera might be best, because you didn't indicate at all what you shoot. IQ of 60D and 7D are identical for all practical purposes, though.
You mention "credit at Best Buy", but what does that mean. You have a store credit from returning something? Or you have a Best Buy credit card? Two very different sets of circumstances.
If you are buying on credit, you might be better not getting a camera at all and saving up for a lens instead... Just stop taking any kind of critical paying jobs, if doing so, because you are in no way ready for that. Or rent/borrow backup gear to be sure you are covered at any job.
Not being limited to purchasing at Best Buy might open up some other possible sources that can save you a lot, too... Canon often has refurb cameras and lenses in their online store. B&H and Adorama often beat Best Buy's prices by a considerable margin. I've had good luck with Beach Camera, and used gear from KEH, too. Some of these stores are even offering free shipping. And buying out of state you won't be charged Calif. sales tax, which ranges up and over 10% some places. Of course when making out-of-state purchases and not being charged sales tax you are supposed to report your purchase when you file your income taxes, and submit the appropriate sales tax to the state at that time. I'm certain everyone in Calif. does that... After all we know California needs the money so desperately... what with 50 year old public employee retirees taking home retirement checks of $8000- $10,000 a month (gross), full health care benefits for life and more... an estimated $9 billion a year (net) in state-covered costs related to having a 2.7 million undocumented foreign persons living throughout the state... on average an additional $90,000 per year per prisoner spent on 670 death row inmates (in a state that's actually performed 13 executions since 1978) and under current proposed changes to the Capitol Case system would add another $100 million per year... and all the other good uses California make of our hard-earned tax dollars.
But I digress...
60D has essentially the same AF system/AF performance as 50D and 40D. Used right, any of these are quite capable of shooting fast moving subjects, sports and other action. 7D would only potentially give a few percentage points more in-focus shots. I went from 50D to 7D and have now been using the latter for a couple years. Setting aside things like composition, catching subjects at just the right moment, etc. - my "keeper rate" from a purely technical standpoint probably went from 94-95% to around 96-97% (my actual keeper rate is quite a bit lower after I edit for other, non-camera-related factors). That's what spending twice the money and taking the time to learn to use the new camera quite well can do for you.
In other words, a change of camera is not going to change your photography very dramatically overnight...
Lenses that compliment and expand upon what you already have will actually open up far more new possibilities.
I have no idea your level of experience. You mention being 18 and having done photography "for a while"... That might mean anything from a few months to a number of years. I can tell you from 30+ years behind a camera that the learning never stops and that the biggest improvements possible are nearly always with the user, not the gear. Among the gear, your lens kit make the biggest difference.... the camera is just a light capturing box behind the lens, and is actually mostly about conveniences and reliability.... Used right, a simple inexpensive camera can potentially "get the shot" nearly as well as the top-of-the-line model. On the other hand, if one only has 70-200mm lens to work with, it's sort of impossible to get the angles and perspectives of a wide lens, or the heavily blurred background of a large aperture prime, or reach out and fill the frame with a really small subject, etc.
In general I would first recommend working on your lens kit, get a second camera if you need it but don't get carried away (60D is quite capable), and try not to end up in debt over your purchases unless you can point to solid earnings your gear is producing that will pay off the debt completely in a short period of time.