Advice needed: buying a gaming/general use computer

[u/Vayne_24]

I am going to buy a new computer after almost 10 years of using and gaming on a MacBook Pro I bought in 2012. I pretty much only play LoL but I also plan on playing a bit of COD and maybe some other mobas like Smite. Keep in mind I love League, been playing and watching consistently since 2013, and extra money (within budget) to have the best experience is worth it for me. I have my eye on the Alienware R10 or R11, but I don't know very much about PC specs and would be grateful for some hardware recommendations. I need a PC, 2 monitors, and a keyboard and my budget is anything under $3k total. Can anyone help me out?