This is how low the car goes with the Toyota accessory springs... Which is about 25mm only.
If you had these fitted when you bought the car (And toyota would not have charged you any labour) it would be worth it, but they will charge you a fortune.
A set of Whiteline control springs or king lows will give you 35mm and most places you go for fitting will charge you far less than Toyota. In terms of Warranty, if you choose these others, if anything goes wrong and it's related to the new springs (highly unlikely) then your warranty is void.