I have the same computer as OP. Been using Mavericks since DP1, runs just fine.
Do you really think that 10.9 will be different?
Ok. Yes Mavericks works. Sure better than 10.8 and 10.7 (made only to do money). I do not understand why apple didn't release it after snow leopard.
It is free because they want all snow leopard user make upgrade. I still remain snow leopard. For my mac runs better. I suggest all snow leopard user to do like me.
Only if you have a SSD and 6GB of ram (1067, or less RAM if Hz are grater) make upgrade: OS10.9 is designed for SSD.
So the real requirements are these in my opinion.
one thing i love about these forums...how people post their singular experiences as a 'global fact'; that their experiences speak for all of us.
ok...I have to admit that after I've installed Mavericks from App Store directly on snow leopard 10.6.8 (no USB clean mode) things are changed.
It's a fact Mavericks prefer to have all ram used (It's not the correct word, I know) but all works. It's like if Mavericks is water in a sponge, and not a king in his castle like snow leopard. It prefers to use all of itself.
Yes xScan say constantly "buy more ram" but mac still goes on.
Perhaps I spoke too soon. enjoy.