I’m not that much of an expert, but I know the basics. Please, if anyone reads this and thinks something I said isn’t true or isn’t recommended, make sure to point it out.
So, to start off, if you have a 1100$ Budget you’ll be aiming for a GTX 960 - GTX 970 GPU (I only know about the nvidia ones, but I’m well aware that the AMD equivalent to those GPUs can be as good and even cheaper).
As for processor, i7 is recommended due to the tendency of the use of multithreading in recent games, specially AAA titles. however, you’ll be fine with an i5 (as long as it’s a quad core).
RAM is a delicate matter these days. While it is preferable to go for the new DDR4 ones, in my opinion DDR3 will last long until they run obsolete. as for memory, 16GB will allow you to run pretty much anything for quite some years. 8GB will be fine for now, but maybe you’ll suffer a bit in 3 or 4 years.
Something really important is having an SSD if the Budget allows it. Not only will the computer start up much faster, but some games will speed up considerably due to the increased Drive-RAM transfer speed. As an example, League of Legends, a game which doesn’t demand all that much on GPU or CPU, has freezes and fps drops due to difficulties when the game tries to load files to the RAM mid game. With an SSD, the problema disappears. However, it is also well known that SSDs are expensive as hell.
As for motherboard, PSU and others, I don’t feel like I know enough to recommend you anything.
Also, if your budget isn’t big enough to get all this things, get your priorities right: will you be editing or rendering videos a lot? Then invest on a good processor. Will you upgrade your GPU in a matter of a few years? Then don’t invest as much on it. If you don’t have enough money right now,can you buy extra RAM afterwards and invest the money elsewhere? Sure, that’s a nice choice.
Anyway, think it through since it’s a lot of money you are spending. Ask anything you want and I’ll try to answer.