replacing liner need some suggestions

i have an inground 18x36 oval pool and in the process of replacing the liner. just having a hard decision with chosing which vinyl liner. it is so hard to decide from just looking at a sample. i am thinking of one that has a prism bottom...do any of you have this design of liner and what is your opinion as to the look of it? also it would be a big help if anyone has a picture of your pool with a prism bottom or if anyone has any other suggestions or could post some pics. i sure would appreciate any all help!