Just for historical purposes, I'll add that Loie and I found the cost of a week in Sardinia to be very reasonable. In 2005, we rented an "apartment" that was one floor of a very nice beach house in Torre del Pozzo on the western coast outside Oristano for about 700 USD. Groceries, wine and mirto were relatively cheap. We ferried our rental car from Civitavecchia as we had been on the Amalfi coast the previous week, seeing Greek and Roman antiquities, so I can't say what a car would cost on Sardinia.

Perhaps a travel agent would try to book a party into one of the resorts on the Emerald (north) Coast, and that could be expensive, if easier than trying to rent a house on one's own.

Sardinia was totally cool. We used the expectedly excellent Cadogan Guide as our base research for the island in general, supplemented with listings from here, the Stone Pages and MegPortal.

The Temple Wells were among the most evocative and atmospheric things we've ever seen.