Just a few suggestions.
1. Ask some other small business owners who they use and see if you can get some recommendations.
2. Keep good records.
3. Be able to back up those records.
I used a separate bank account and a separate credit card when I was involved in a business.
Keeping a daily log helped me keep track of both major expenditures and the little expenses you sometimes forget. At the end of the year, they can be a surprising amount.
4. Be organized. If you are audited, the examiner will want to be able to do his job without waiting for you to dig through a box of miscellaneous papers.
5. Don't try to cheat the government. They will have a lot more experience catching cheaters than you will have at cheating.
6. If you are audited, just be up front. Despite what you heat, the IRS isn't looking for people to put in jail.
7. As far as the value/cost ratio, consider the fact that the time you spend doing your taxes is time you could have spent detailing a vehicle. If you are audited, plan for spending a day with them that you also could have used detailing for pay.
I used a CPA for the first tax return and it cost close to $1000 in the late 1980's. Once I had it done professionally, I purchased a tax program for my computer and have done them myself since that time.