If you are wanting to go that route, look for a set of coils the end in 58/59 for the front and 18/19 for the rears (iirc it could be the other way around too) and compare them to yours, the bigger the difference the more lift you will get. You will go anywhere from 1/2 to 2 1/2 lift depending on what you already have installed. Now that being said, the ride stays the same, bit stiffer as the coils are set up for a 4dr. From what I remember you want to find coils from a 4dr with a tow package and hard top, it should have the largest springs, but it's not always the case so always check the numbers.
Is it worth it that is a matter of choice, you can swap out just the coils as that is the biggest difference, as well as the rubi has gas charged shock , I've been told it is a better shock the the x or sport. The Saraha already has the same shock as the rubi, so not much difference. If you are wanting a cheep lift, just go with a spacer they can be had for cheep, and ride will stay the same.