It's not hard to build. Please do not buy a pre-built because you'll be wasting your money and that's a lot of money to waste. $1500 will get you a killer rig, easily, if you build yourself. There are hundreds of tutorials on YouTube but you'll only need to use one as a rough guide, it's all pretty straight-forward and simple.

Do you need a monitor?
Do you need a mouse?
Do you need a keyboard?
I assume you're not interested in overclocking at all?
Do you need an OS or can you get that for free?

Sanctorum wrote It's not hard to build. Please do not buy a pre-built because you'll be wasting your money and that's a lot of money to waste. $1500 will get you a killer rig, easily, if you build yourself. There are hundreds of tutorials on YouTube but you'll only need to use one as a rough guide, it's all pretty straight-forward and simple.

Do you need a monitor?
Do you need a mouse?
Do you need a keyboard?
I assume you're not interested in overclocking at all?
Do you need an OS or can you get that for free?

I dont have an OS. but i do have a keyboard mouse and monitor. and no oveclocking for now

I would definitely recommend building your own. Much better bang for your buck and it's kind of fun. I had no idea how to build one before I built mine but I followed this video and it was simple

I'd go with something like this;
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Included a nice 1440p panel because you can add another 390 in to the rig at any point, and even one 390 is kinda overkill for 1080p anyway. $200 under budget so buy some pizza or whatever, or if you want, save it until you have enough to add a 2nd 390.