From the cheapest to the most expensive. Look at the feature they offer, namely RAID/Dual NIC/More Sata/eSata and so on. Any of these board will take you to 3ghz, it's a matter of which feature you like.
You will also need ram capable of DDR750, DDR800 would be a good choice!
Is there really a point of getting the Gigabyte 965P DS3 over the Gigabyte 965P S3? Unless I'm missing something the only difference is the DS3 will live longer, it would be like 7 yr life vs 10. Nobody in their right mind would keep the same motherboard for that long.