Retail Mac OS for MacbookPro 2,2? What is best OS for  MacbookPro 2,2 with new Harddisk(empty),  3GB RAM and 500GB HDD ?

Mac OS 10.6 or 10.7 Retail will work ?

ps: I am not having the Restoration DVD's came with macbook.
According to Everymac it can use anything from 10.4.8 to 10.7.5 

I'd always be inclined to go for the latest OS a machine can use, even though it might make it slower than the earliest.