We are resurfacing our gunite pool. I'm curious about the range in prices on ceramic (or is it porcelain?) waterline tile? I ask because our contract was quoted with 6x6 but (given the curves or our kidney-shaped pool) I think 3x3 is better. This is raising the basic installed tile price by 40%. Also, does it seem reasonable that an upgrade tile would be $40 / ft2 more than a basic blue? The tile company is not able to give me any price information since they only deal wholesale to pool companies. Thanks for any insight you can share.