Chris, if you feel the need to register to an ISO standard, then register to the 2008 version, especially if you are a small business.
I would wait and see if its even feasible for your business to afford to implement the 2015 revision if you determine that to be necessary. The full ramifications of the 2015 revision and its paradigm shift away from quality and into risk management might be far to daunting a task for any small business to undertake. I have spent time with many of the pros who are attempting to setup instruction for the new revision and have discovered that there are issues related to intent which they have not considered.
If you are going to consider the 2015 revision, then read both ISO 31000 and 31010 and discuss those and the DIS version of 9001:2015 with your legal representatives. There could potentially be huge product liability issues related to the 2015 version of ISO 9001.
Quality management systems don't on their own improve quality, that is a decision a business must personally make related to serving its customers (ISO or no ISO). Many companies make the mistake of implementing a QMS, as a means of improving quality, and where there are some prescriptive controls (in 2008 version), it's still the responsibility of the organization to define its customers and their expectations as well as the controls which will be put in place in order to assure those expectations are continually adhered to.
It would be my suggestion to fully understand what your committing your organization to by registering to a prescribed ISO Management System Standard. There will be costs associated with implementing and maintaining such as standard.