Since he is here asking the right questions & educating himself he will be able to make an informed decision in either direction.
FguerraG, both receivers & prepros have a separate input for a sub. So all you will need is an IC from one to the other.
Lots of people including myself, use a receiver with a separate amplifier. It all depends on what you want. Most prepros don't have the latest & greatest bells & whistles & update more slowly. They also cost more. But generally thoght to have superior sound.
A lot of companies upgrade thier receivers every year, so no sooner do you buy it, it is almost obsolete. They have the latest & greatest, but generally fall short in power.
So just figure out what you want & go & audition to find the one that sounds the best to you.
Not to belittle you or anything, but the very fact that you're asking these kind of questions tells me that you should be looking for the easiest solution, which would be a receiver.