There isn't really a comparable ski. Many will say the AC4 or AC3, but they're both much turnier and softer than the Pro. AC series is more slalom-like, and the Pro was GS-like.
Take a look at the Nordica Hot Rod Top Fuel. I spent 2 years on the Pro and I feel the Top Fuel is a big step up. Same GS feel with the ability to make any turn shape. More stable, better grip on hard snow, little wider (mostly in the tip) and better off-piste. If you want to stick with Volkl, give the Mantra a shot if you live in the West, you might be very surprised.