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If you cannot afford to set up shop then don't open your doors, or at least scale it back to keep your doors small so you can handle the business.
I'm finding my approach to be more old fashioned, and in fact, eccentric at this point, but for the ultra conservative you gotta give it credit.
Seed "loaned" capitol verses have on hand chunk of cash.
When you pick up a loan for your operation, they are charging "less" then credit card rates, but more then mortgage. Likewise, the longer the term, the more money they make out of it, and in fact, when it's all said and done, you are looking at an average rate of 33% mark up from the initial loan and this is being paid off in 3-7 years, so you have to take this into consideration before you decide to "finance" your way to the future.
I suggest going one of 2 routes and they both hinge upon what location, gig, or general actual nitch you are filling can handle you and you alone in a unique way can fufil, and even then only if it proves adventagous as well as generally accepted in order for it to fly.
So, in case you haven't figured out my point of view by now, buy directly what you can afford, even if it's a used, as long as it can take care of your direct short term application. From there, take it's profits to upgrade. If you never lose sight of that ideal, you'll do well and of course will turn into a working, high end operation.