Kosti,
The Aquaero can do [1], [2], [3] with a few of the peripheral devices that are available. It is unlikely that, if properly configured, the Aquaero would fail to detect an alarm situation to shut down your PC, so smoke detection is not really necessary. The Aquaero is the best consumer controller and monitoring device available for watercooled PCs. You would need a few temperature sensors, one flow meter per cooling loop, a pressure sensor for each loop, possibly the waterblock for the Aquaero depending on how many fans you want to attach to each output to keep the fan amps cool, maybe some Poweradjust units to power extra fans or your pumps, cables, RGB LED etc. Perhaps you want to consider the Aquacomputer D5 pumps or the Aqualis reservoir with integrated pressure/fill sensor .... the list goes on. You won't need everything, it will vary depending on how many fans and pumps you want to control/monitor, how many of the features you want to use, and how much money you are willing to spend.
A basic starter setup would be an Aquaero and a couple of temperature sensors for your loop and you would already be able to do a lot with that, but you will probably find that you will want more once you realise just how good the Aquaero is and what it can do. A great advantage of the AC products is that you can add extras as you go along so you don't need to buy everything at once.
I suggest you browse the website and the forum and have a look at what's available and what can be done, make a list of things that you would like, then plan your system and ask specific questions about the devices you wish to integrate and then decide about finances. There are plenty of people in the forum who can assist you with the maths for choosing your devices (eg Maximum number of fans per output channel?) I can say though that you won't be disappointed in choosing an Aquaero. It is by far the most flexible and feature rich device for your watercooling setup and is worth spending the money on. The English user manuals are a bit spartan with detail though and can put you off if you don't understand what's going on if you run into hiccups, but the forum is always a good place to get answers. Shoggy and the guys at AC do their best to help users sort out difficulties they are having and there are plenty of experienced users who can also help.
I hope you don't have to part with your kidney but be warned, the cost of AC products can add up if you get hooked!!!
A good place to start would be to let us know about the system you want to control/monitor. How many cooling loops? Pumps? Fans? Which types/brand are you using?
Hope this will get you under way.