if you have any asthmatics in the house or eczema suffers i would avoid vynil flooring as off gassing can be a problem. also with bamboo flooring formaldahyde off gassing can also be an issue.
silkwood flooring is a good product.
boral themselves recommend Boral Regupol RV-4 accoustic underlay. certainly speak to a boral rep for more details but it is important to try where possible to stick to tested systems to ensure warranty.
i never specifiy a floating timber floor without a plywood substrate. costs more but works better.
only issues i have encounted are more qld humidity issues. if the floor is installed on a humid day cupping and shrinkage can be an issue. this is a problem with all strip floors.
another product is mafi wide plank floors.
http://www.homestone.com.au/mafi.htmlthey are prefinished also and have oiled boards. i would use sealed around kitchens.
always seek professional advice from the manufacturers and take my words with a grain of salt.