I may get some flak for this, but I really feel as though this deserves Trapfinding. I know that would cause it to trample on the rogue's feet a little more, but I am confident that the better BAB, better HD, and UMD as a class skill will offer a solid alternative (well, also among the unique rogue assets and the massive skill point gap).

Two things on the spell list: first off, what is Melf's Unicorn Arrow; secondly the Bigby's X Hand really feel out of place because they are very obtuse/flashy spells on what is mostly a very stealthy/roguey looking list.