Prez:
If you've ever traveled to Europe before Spain is not difficult to navigate around in by train and bus. It would be really easy to have a simple vacation going from Madrid to Sevilla (via Cordoba) then also spending time in Toledo, Segovia & Salamanca. However, if you're husband's mind is set on a tour....

Question -
Did you check out dates for Trafalgar, Insight, or Petrabax tours? You may be able to find dates that coincided with your Globus tours and the prices are usually comparable.