I bought the iLuv translucent case from Fry's last Friday. I tried on the Incipio Feather and i did not like it at all. It had no grip and i just didnt like the finish.
The iLuv is just as thin (maybe a mm or so thicker) and comes in both translucent white and black. It also has the "grippy" texture you are looking for. I looked at a bunch of cases and liked this best. Thin, light, protects against scratches, and keeps the iPhone looking like it was meant to....sexy.
http://www.bhphotovideo.com/c/product/752346-REG/iLuv_ICC743_BLK_Translucent_Case_for_iPhone.html
and at $15, its hard to beat.