The windshield idea is a waste of time. I went way out of my way twice to work a windshield into the equation and then work around the lines of a windshield/ZJ. Do you know how long it lasted? 14 hours. No more windshield. If I had just ditched it to begin with it would have saved me time, money, and made design easier.
If you do coilovers, go to 14's. It's worth the extra few bucks. I know you can get DT CO's for pretty cheap, but for only a bit more than that you can pick up the SAW's which seam to be much nicer. I run 14" SAW's and I'm lookin to put some up front--mainly for baja purposes.