Whether or not to include a CMS in your initial website investment will typically hinge on a couple of factors. The first is whether you anticipate the need to update, maintain or create new content on a regular basis (typically at least once a month).
If the answer is yes, then a CMS may be a good way of doing so. The second factor is whether you can provide the necessary human resource to be able to work on the CMS. Whether yourself or one of your staff members, you will need to be active in maintaining and creating content for a CMS to be a worthwhile part of your strategy.
If you do not have time to maintain your site yourself, but would like your site to be kept up to date, you can always take advantage of one of our maintenance plans instead.