Which mac os install disck I need to buy?

hello chaps,
I just replace my imac's harddrive and I need to install mac os again, however I lost my orignal installation disk, after some googling, I am pretty much sure I need to buy a retail version installation disk, however I am not sure which version exactly I need.
my imac is EMC 2390,  so I think it's a iMac "Core i5" 2.8 27-Inch (Mid-2010) version, I wanna to use OS X Mavericks, but I guess I still need to install the old version mac os first right? (I guess is snow leopard?)
Many thanks!

Was your old Hard Drive still working?
If so, put it into a USB enclosure or get a universal drive adapter so that you can boot from it.
If you were on Snow Leopard, startup holding the Option key and navigate to Disk Utility. From there you can setup the new HD and then Restore the OS X from your old hard drive to the new hard drive.
If you were already on Lion, Mountain Lion or Mavericks startup holding the Option key and startup into the Recovery Partition, then setup and restore or reinstall OS X on you new hard drive.

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