Prince o3 speedport series, or prince ozone series?

I think you should focus more on weight than anything else. Weight is what you feel the most on the frame. the way I figure it, the stronger I get, the heavier my racquet becomes. When I first strated playing, my frame was around 9 ounces. Now it is 11.8 ounces. The advantage of a heavier frame is you need to do less work. The racquet helps swing. If you have a lighter frame, you need to do more work. I found that my arm got sore after a couple hours of play with a light frame. But it really is up to you based on your style of play. Good luck!!