I would like to buy a 4.3 Marimba for my son. Kori seem very competitive and offer sevsral models including Student models(series2) and Some with Rosewood-Lite,which is less expensive. Appreciate any input on pros and cons various models.(Kori web site:custommusiccorp.com). Any comments on Ross 4.3models? The other makes are a little bit over my budget.Thanks.