Hi,
Well, this depends on many other factors - like the traffic on the page (you told us that you have a small traffic), then on the number of documents, what modules you are using and what operations are made in the
CMS.
200MB of memory is enough for example for personal sites or small company sites, but not for large sites with hundreds of documents, etc. Also, during the web installer you can select which modules to install and which not - this is also made for this reason to decrease the memory usage. Also, it depends on the hosting plan you have - you can still have dedicated server on DiscountASP and it will work fine.
Best regards,
Juraj Ondrus