I was orignally going to go for a 16" wheel & use my tyres off my factory wheel, but ended up knocking that idea on the head.
16"s can look fine when the right height is dropped and levelled out (NPs tend to sit arse high to start with)
Look around, find a wheel you like, then weigh up if its cheaper to go for a wheel & tyre package or just wheels & sourch your new tyres else where & just get them fitted & balanced anywhere.
Its worth doing your homework as there can be a saving