I had a similar model:
mid-2007
2.4GHz C2D
4GB RAM
Nvidia 8600m GT 256mb
I wouldn't recommend it with a mechanical HDD. I had a 500GB 7200RPM HDD in there and it was sluggish as hell (though it still performed better than Mountain Lion).
Once I installed an SSD the difference was dramatic. With more RAM (like your model) Mavericks would fly.
Either way, I'd avoid Lion/Mountain Lion. They leave a bitter taste in the mouth after the smoothness of Snow Leopard.
mid-2007
2.4GHz C2D
4GB RAM
Nvidia 8600m GT 256mb
I wouldn't recommend it with a mechanical HDD. I had a 500GB 7200RPM HDD in there and it was sluggish as hell (though it still performed better than Mountain Lion).
Once I installed an SSD the difference was dramatic. With more RAM (like your model) Mavericks would fly.
Either way, I'd avoid Lion/Mountain Lion. They leave a bitter taste in the mouth after the smoothness of Snow Leopard.