Ditto on the comments about the built-in overdraw. It was not until last year when Hoyt finally dropped the built-in overdraw on the Magnatec. In my opinion, this was a big step in making the bow less sensitive to shooting errors and more accurate overall.
Considering an ZR200 limbed 2003 Magnatec Cam and a Half sells for around $300 in my neck of the woods I say that you should stick with the newer model.