This is probably the question we get asked the most about Hosted SharePoint - which version do you need? The below tables outline the exact features of the Foundation, Standard and Enterprise versions, and should provide a good guide for your requirements.
Document & Records Management
Intranet Site
Business Intelligence
Search
Internet Site
At Extend, we do not offer SharePoint development or customisation, but we have several partners that are experts in this field. Get in touch if you need a SharePoint development or customisation quote.