How fast/slow do you throw it? That's a huge factor to be taken into consideration.
If you throw it faster, you'll want a more reactive ball that will read earlier, if you throw it slower, you'll want a less reactive ball that will read the lane later.
I'd define slower as 10-14mph, and would suggest a ball along the lines of a Tropical Storm, or an Ebonite Tornado.
Faster would be around 18+mph, and I would suggest a ball like maybe a Storm Marvel.
Since you say you cover 13 boards with a house ball, I'm going to assume you throw it slower. Of course, your best resource for help would be your local pro shop owner. If you ask him to watch you bowl, he'll be able to give a much better suggestion as to ball choice.
Good luck and have fun!
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