Bought this board for my son in a 118. He rode it for a year then passed it on to my daughter. I have used that board to get a few different kids up for their first times and then some. If your willing to spend a little more, you can get a more modern board. One problem might be with the bindings. You might have to buy two different pairs for the youngest and your oldest. I would go a little big on both that way you might get two seasons out of them. I would bet you could recoup most of your money back if you were to sell in a couple of years, or keep them around for any other young kids you might have out on your boat.
http://cgi.ebay.com/BRAND-NEW-Liquid-Force-Nemesis-Wakeboard-Size-124cm_W0QQitemZ300388346061QQcmdZViewItemQQptZLH_D efaultDomain_0?hash=item45f08a68cd or call these guys
866-444-BEAR
I have bought a ton of gear from them, and there prices are as low as you will find, plus great customer service. Call them up and let them know how much you want to spend and what you need. I bet that ends up being your best bet.
(Message edited by pnichols on February 17, 2010)