That should run Mavericks nicely! Mavericks is, IMHO, stable and quick.
Many are advising a clean install. I did a clean install when I moved from a regular hard drive to an SSD. Prior too that I think I installed Mavericks via an upgrade. Haven't had problems either way.
If you are experiencing any kind of system hiccups try a clean install. Otherwise you are probably OK with an upgrade. In both cases the installer comes from the app store.