i would suggest try to go for 1.5 width. 1ft for width it too tight for a marine tank. it is difficult to create a 3D view. unless you are very firm of your scaping and tank concept. otherwise likelyhood is that you will want to have almost every piece of coral in your tank.
just sharing my personal experience. i am having a 2x1x1. i find the width is too tight. cause alot of scaping and placing of coral issue. and tendency is that you will alway want to put in more coral and try to squeeze out more space.
end of the day, you will find yourself rescaping and creating more space to accomdate the coral. at least this is what happen to me.