All the choices you mentioned are thicker than the Camper, although some not as much as the others. According to sources, these are the following thickness measurements of these knives:
Camper: 16.2mm
Super Tinker: 17mm
Mechanic: 18.1mm
Spartan Lite: 19.5mm
Cybertool 29: 21mm
Technically, all of these are 3 layer knives, although the middle layers, the one where they usually differ, have different thickness.
Right off the bat, I would say that the Spartan Lite is the least appealing of the models for me. Maybe it's just me but I prefer my knives not to have any electronic parts in them. It makes them harder to clean and prone to problems. I've heard bad reviews about these "Lite" knives. Some say they can easily turn on accidentally, some say that the light is not powerful enough. In any case, I only say it is less appealing simply because one of your other choices offers what it offers and more. True, it is 1.5mm thicker, but I believe the Cybertool 29 offers much more than the Spartan Lite does. Both have all the basic tools, from the blade, to the openers, to the 2 standard screwdrivers, to the reamer and to the corkscrew. However, while Spartan Lite offers one phillips screwdriver, the Cybertool 29 offers 8 different screwdrivers in that same layer, one of them being the size of the phillips screwdriver that the Spartan Lite has. Furthermore, the length of the screwdriver in the Spartan Lite is half that of the bit driver of the Cybertool 29. And I'm sure you can see why a longer screwdriver is better than a shorter one. What you lose with the Cybertool 29 is the led light of the Spartan Lite, which in any case as I mentioned earlier, might not be that big of a loss.
I'm not insulting the phillips screwdriver of the Spartan Lite, it in fact is one of my favorite tools in the SwissChamp, because it works well. All I'm saying is, if you're concerned about the screwdriver (me not so much, I just need the minimum hence my love for the basic phillips in the SwissChamp), you might as well go for the Cybertool 29.
Now, if you mean to say that you just need a basic phillips screwdriver, openers and a reamer, well there is always the Tinker which is thinner than your Camper, and therefore will be much more pocketable. It however places the phillips screwdriver in place of the corkscrew. Being there, there are times when it is rendered useless because the configuration does not allow it to reach corners. Still, that option is there if you don't think you'll meet many of those corner phillips screws.
Regarding the pliers, I was of the opinion before that they were not very useful for the size that they take up. Recently though, I have come to realize that they are indeed very useful and a blessing once you need them (lesson taught to me by my SwissChamp). I've heard that they're very good for fishing when one needs to take the hook out of the fish. It is a good quality tool, but you have to know its limits. Treat it more like long nosed pliers instead of the thicker ones. It will serve you well and basically replace your fingernails for things you need to grip or pull really tight. If you need pliers, the Mechanic is good because it is the Tinker (I mentioned earlier) plus the pliers.
As for the reamer, all of them have reamers. And very good ones too.
Cheers!