Our desired workflow is as follows: 1. Creation of quote data for a specific project within Excel using a template containing a myriad of formulas necessary to accommodate technical selling. 2. Specific data (line item prices, product types, project duration) is pushed/pulled to/from a specific Opportunity within Salesforce through a native interface - either Excel or Salesforce.
I have found many third-party apps and tools that permit some sort of import functionality, but most are cumbersome, are designed for managing large data sets and reporting, and would not be supported by our sales team.