I would go cheap white, and get someone to spray the tub white.
I would not go to all the expense of a TotoŽ just now. Say your remodeling plans make your choice of $$$ TotoŽ a problem in the future? Say the style you choose now does not go with your choice of style for the rest of the bathroom in a few years to come? That would be a mistake.
Say you don't actually get round to remodeling the bathroom and you have a $500+ lump of porcelain sitting there? That would be a waste.
Buy one when the time comes. In the meantime get a Šadet 3 to see you through.