I would go with one of the MXZ's. I personally have never been a fan of Cat's (except the racers), and as teamarctic14 said, the MXZ with the pictures is in better shape from what I can see. The ZX chassis (MXZ) is a great riding chassis, and I know I won't be trading mine any time soon.
2002 Ski-Doo Renegade 700
-RSI Backcountry Bars & 7" Riser
-Powermadd Throttle and Brake Extensions, and Handguards
-ZBroz Remote Reservoir Non-Adjust Front Shocks with Triple Rate Springs/X Center and Monster Performance Rear
-SlyDog Trail Skis with 6" Shaper Bars up front; 2" track out back
-Boyesen Rage Cages
For All Your Shock Needs:
Monster Performance and Custom