Q: Which version for Intel Core Duo?

I have an early 2006 Intel Core Duo 17: 1.83GHx iMac. I need to do a clean install and no longer have the original discs. I have read that I will need 10.4.4 or higher.

The retail copies I am finding on eBay just state 10.4. How can I be sure to get the correct version for Intel based machines?

thanks,

Rob