As a technical advisor to a patent law firm, I have seen that there can be a huge difference in the value of a patent, depending on the professionalism of the patent attorney.
If you believe you have a million dollar idea, it is well worth the expense of getting a high quality patent. Of course, the problem is that you may not know if the idea is worth anything at this stage.
Still, you may later regret the few thousand dollars you save by using a less expensive patenting process.
I will add that a really good patent attorney does not only write a patent. S/he will look at the core idea, discuss with you your business plan, considers additional ways you may not have considered that the idea could earn money, and devises a patent strategy that will protect your interests. This process is more expensive than just banging out a patent (which may not end up protecting what you intended).
Best of luck in your venture.