Ken, you ponder the same question that led me to my LX700 I own today. I wanted a better hole shot, top end, etc... For the cost of a larger motor (with trade) I could upgrade to a late model nearly new LX700. I love the new boat and the larger motor attached to it.
At a 90hp you're probably pushing 47mph and I can't imagine your hole shot being too bad right?? 125hp is only gonna get you into the low 50's and the only other reason I can possible think to replace would be to put a Honda on it, of course all IMO though.
Probably shouldn't ask the wife what she thinks.
B/R
Wildwood