I usually tend to finish all of my current playthrough's before moving onto something else, though every now and then one of several games I play at once turns out to be not worth my time and effort after which I replace it with something better and more interesting. Recently, it was the case with Dragon Age II which I suggest you drop and hop onto something better as it's a bad game overall not just compared to Origins.

I also don't have a problem giving upon a game I already played, once or several times, and switching onto something new. Seeing as you've played Final Fantasy IX already, and you have Crisis Core coming in which in my opinion is better than VII itself I suggest you do the same.