I am about the same size. 5-9 1/2" and just under 160 pounds (though my normal waist is 30"). I just picked up a pair of the Petit Standards 28 this past weekend and they fit perfectly. Just a heads up - the Petit New Standards in 28 were a bit too tapered for me. The leg opening was so small that I actually ripped part of the seam on the cuff when trying to remove them! Luckily the folks at the APC store were very gracious and didn't charge me for the damage.
Let us know how that works out.
Thanks masn, now I feel even more like i did the right thing :)