lonestardreams

I love the 6x24 ruler and use it the most. I also use a handle on it to keep my hands away from the rotary cutter. You can get those at Harbor Freight. Most of my rulers are Omnigrid and like the contrast the yellow lines give.

I noticed the Hancock's has their quilt notions on sale- 40%. It might be a good time to look if there is a Hancock's close to you.

eparys

I have been doing this for 4 years now, so I have accumulated many many rulers that I thought would be useful. Than being said the two I use regularly are a standard 6 x 24 and a 6 x 12.

My 6 x 12 is this ruler
http://www.olfa.com/RulersDetail.aspx?C=66&Id=144
I use it for all of my smaller trimming up projects because of the angle lines radiating from the center.

NJ Quilter

I agree with many others here in that all rulers are not created equal! Use the same one start to finish in whatever project you are doing. Also a 6 x 24 is great but if you can find a wider - say 8 x 24 that suits you, you may like that better. I've made a number of quilts that call for 6.5" cuts and it's a pain to line up 2 rulers. I finally found a 7.5 x 24 and use it most now. Also a 12.5 x 12.5 will allow you to square up most anything. Those 2-3 rulers will get you through just about any quilt making you might want to do for quite some time.

Only other suggestion I have, while shopping for rulers, pick out a few fabrics that you really like in several different colors/values. Put the rulers up against the fabrics to see how easy it is for you to see lines on the rulers when using with 'real' fabric. Some are easier to read than others. And as others have also said, find a brand and stick with it. It will give you the flexibility to use different size rulers throughout your project still getting the same measurements. I also have a small 3.5 x 6 ruler that comes in handy for just straightening up edges and such without having to manipulate a larger ruler. And pick up some clear sticky dots for putting on the bottom corners of your ruler. Makes them non-slip!

Dolphyngyrl

I use my 5x19 ruler and june tailor shape cut the most, and my 9x9 ruler to square up when finished

happyquiltmom

The rulers I use most are 6 1/2" x 24 1/2" and 12 1/2" square-up, both Creative Grids.

Sadiemae

The ruler that I abolutely have to have is my Omnigrip 8 1/2" x 24". I like it much better than the 6" x 24", but that is just my preference.

OKLAHOMA PEACH

have several but would really like a 2 1/2 x 24, I seem to make so many strips and squares.

MadQuilter

I use the 6x12, 6" square, and 15" square the most. Then I have the Circle-A-Round by Cheryl Phillips for inset cicles which is the best thing since sliced bread. One of these days I may get the 12 1/2 square because the 15 is just a bit big and most of my blocks are 12 1/2".

It is not just the size that matters but the color too. I actually prefer the ones with the black and yellow markings. The ones with the green markings drive me to drink.

bearisgray

I've just started to use the Olfa Frosted rulers and I really like them.
The lines are nice and thin and it doesn't feel 'cluttered'

The Quilter's Rule line has thick lines/grids/grippers - and I don't use them anymore. They also seemed to 'shave down' faster than some of my other ones.

I have quite a few Omni-Grid ones, but I'm starting to prefer the frosted ones.

My favorite ruler for tiny pieces is the 4x8 Omnigrid with the 1/8 inch grid.

I also prefer the 1/8 inch grid 3 x 18 inch Omnigrid ruler to the one that's marked 'the other way' of the Omnigrid 3 x 18 inch ruler.

I will say that it's good to check ANY ruler against the other one that one is currently using.

Also, rulers WILL wear down (get shaved/eroded) after a lot of use - I've ended up with shallow curves in the center of longer rulers because the center gets a lot more use than the ends do!