I agree with the others. There isn't enough difference between the two to go spending the money. I'd suggest working and saving your money till you can afford a really decent upgrade. That doesn't mean a $700 bow. There are quite a few in the $300 range that will be a serious upgrade when the time comes.

Also, as you got your Nova used I'd suggest looking at a few used ones again. There are lots of guys that get new bows every year or two or three and sell their old ones. Usually nothing wrong with them whatsoever. In this case it's possible to pick up last year's $500 for about $300 or so. A much more desireable alternative for someone at your age and experience level. And certainly better than just another entry level PSE.