The CE has is not as bright as the Q5. I don't remember what LED was in it, but get the Q5 if you can find one. The P3D is the older version of the current PD30. The PD30 has an R2 emitter with a little more output than the Q5 and now comes with an R4 emitter with 265 lumens output. It is very bright, but more of a floody beam versus the P3D Q5 and PD30 R2. Some people like the floody nature of the R4, but some prefer the better throw(but less output) of the Q5 or R2. If you can find a P3D Q5, get it. It is a great light, but don't pay more than $45 for it. If you can't find it for that price, get a PD30 with the R2, unless you want to pony up $70 for the newest R4 version.
Long story short, I wouldn't get the CE. You can probably get an P3D Q5 for the same price, or better yet a PD30 with the R2 for just a bit more.