I cut my strips 1 1/2". A smaller blocks gives more possibilities for attractive arrangements. Have made some wall hangins with 1" cut strips, but that's a heap of work that I won't do often.

I like the 1.5" (1" after sewing) for exactly the same reason as Lori...the overall look is very pretty. I've done the 2.5" (2" finished) for a camping quilt made out of plaids/solids for my BIL and I liked that look as well with the plaids.

I cut 1.5 inch strips( no larger) for 1 inch finished. I have done smaller but for scrappy not bigger than 1.5 is my preference.
This was my latest scrappy log cabin done in cut 1.5 inch strips.
http://www.quiltingboard.com/t-133140-1.htm

I like 2 1/2 strips.

I find log cabins made with 1 or 1.5 inch strips to be so much more graceful and visually pleasing than the wider strips. True, they do take a lot more time, and they can become quite heavy-- there's a lot of fabric in the seams. But the fabrics blend much better fora graphic look.

I've made some log cabins quilts where the strips were not cut uniform widths. They were all between 1 and 2.5 inches, but no exact measure. I then trimmed the finished blocks to be a uniform size, and there was surprisingly little discrepancy in the vast majority of the blocks. The finished quilt is one of my most complimented projects, and most people don't even see that the strips are not uniform widths-- they just comment on how it makes a really cool pattern that almost glows. After that success, I doubt I'll ever fuss over exact cutting and piecing in a log cabin again.

RST

I like 2 1/2".

ditto

My first quilt - years ago - was a log cabin done with 2.5" strips. That was way before jelly rolls were common. So I guess 2.5" is a time-tested width.