I'd definately go with the Pro40 dually..

I had a '02 Pat single cam.. it was a good shooting bow... but I didn't care for how front heavy the bow was... it would fall forward like it had a 3' stabilizer on it.

The '03 pro40 is much better balance... and will also be quite a bit faster.

I currently shoot a '03 Pat dually and love it... The dually's draw is a bit stiff and has a short valley.. but I found it very easy to get used to.. and I can't rave enough about this bow.