I just purchased a new office chair a few days ago at Office Depot. I too am only 5' tall so the ability to lower the seat far enough to allow me to plant my feet firmly on the floor was important. I went to the store and tried them all ... of about 20 chairs only 3 adjusted low enough for my height.
The chair I chose is a WorkPro quantum 9000. It has mesh seat and back (which I wanted), adjustable height, adjustable arms (two ways, height and swivel in-out, they can also be removed), adjustable seat back height (for lumbar position), adjustable seat back tilt, and adjustable seat depth (closeness to seat back). The other nice thing is that when the seat back tilts, the seat does not - so even tilted all the way back my feet are still firmly planted on the floor. I really can't think of any further adjustments I would want to make to a chair than this one doesn't already have.
Assembly was easy.
Here you go ... found the link to the chair on Office Depot site.
http://www.officedepot.com/a/product...ies-Ergonomic/