I regret getting rid of my first Custom (had Pegasus on it). I think it was a 94ish model. But I digress....the NS Premier (mens version of the infinity I think?) is great in the moguls. I noticed a difference right away with the rocker/camber setup on the NS boards...bombs right along on the groomers as well. However, any of these boards will feel much better than that old Custom at this point. Search reviews here as well. Good luck and welcome.
The SL/Legacy are the Men's version of the Infinity.