If you are learning to water ski, starting out on combo water skis has now become an easier task than it once was, because of new designs and features. Certain features such as an "aggressive rocker" and a "wide fore body" will allow the water skis to get up on top of the water quickly. The combo water skis also have an aggressive bevel for good edge hold when turning.
Combo skis also have adjustable bindings, so depending on weight, it will mean that the skis can be shared easily so everyone can have a go at water skiing. If you have youngsters learning to ski; two of the most popular skis are the O'Brien Junior Vortex and the HO Blast. However if you're a bit late having a go at water skiing, like World Champion Ernie Ward, you may want to look at the O'Brien Performer Pro because these are definitely worth checking out if your looking to invest.