Help with ski upgrade

Hi everyone, I have been a pretty good skier since I was about 15 years old (so about 15 years now) and in the last 2 years have got into short line skiing. I ski on a 5 year old O'brien Allegiance and like it but am looking to upgrade. My cousin has a HO NOS and I have tried that a few time and think it is AMAZING. What I know I want is an edge to edge concave but I am unsure of the rocker effect on a ski. I am 210 pounds and am riding 28' off and getting shorter so if will have to be 69" or longer. I have found a NOS, a Monza, and a CDX, all 2 year old HO's and at a good price. I would also be open to a Radar but don't know many of the models. So what do you think would work for me and be something I could use to advance my skiing as far as it can. And what effect does the rocker have on a ski. Also I have been looking for a good forum like Wake World but for waterskiing any suggestions.

What speed are you skiing? That will determine what length of ski to go to. If you are running 34 mph+ and looking used the Sixam SS would probably be a good way to go. The allegience was based of the Sixam so there would be some familiarity there but the SS having the stiffer core and faster on edge.

I was never a fan of the Monza, it may have just been too much ski for me but I found it to really punish the skiier for mistakes and bad body position. It just didn't feel user friendly.

The senate C or Vice might be worth a look from Radar, based off of the Strada mold but the Vice just being a slightly softer layup and the Senate C being full carbon but .2" wider than the Strada. I'm giving the Senate (non c) a demo and will tell you how it fares but right now my personal best is only 4@22 off at 32 mph so you might like a step up from what I'm skiing.