Welcome aboard, Cristian1022.

The short answer is that the Raspberry Pi isn't going to run the
full range of emulators and games you mention.
(I'm ignoring for the moment that an attempt to "run all the games" is pretty much
guaranteed to end in failure -- see the FAQ
here.)
A 2 core (more cores are wasted for MAME) 3+ GHz processor (Intel i3/i5 or similar) is a good place to start looking.
There are lots of "What computer do I need to buy?" threads with more details -- the search icon at the top of the page is your friend.

Scott