About 8 months ago I bought a Cougar III with Tru-Arc+ cams and Mag limbs. The bow is only used for target shooting and is a great combination. But its now time to get new cables/string for the outdoor season. The Tru-arc cam has a nice hard wall which I love but from other posts I believe its been discontinued for 2007.
My questions are these: -

Is it worth changing cams at the same time I replace the cables? If so, what would be a good option to move to?

Also, it is worth changing to a shoot-thru system? Are there any real advantages/disadvantages?

For additional info, I currently shoot at 57# with a dl of about 26.5". I will be changing weight to 60# soon.

All help appreciated.