I have been doing a lot of research on this topic since I am ordering a new gaming PC myself.
Here are a couple of points for consideration.
*Make up your mind on whether you want an AMD or Nvidia n Intel components. AMD is a budet friendly plus more readily available in Europe and particularly Uk. Where I live, (Dubai) the market favors NVIDIA.
*If you decide to go with AMD, stick with it and try not to mix and match, select only the best fit for an AMD based rig. Yes at the moment, AMD, Intel and NVIDIA components are compatible (hasn't always been this way). But you want a smooth functioning PC and not a beehive that lives on errors due to hardware mismatch and constant errors.
*Contrary to popular belief, AMD is not inferior to NVIDIA, its more of a case of PEPSI vs Coke, for the record, PEPSI, kind of a situation. Saying that, AMD is more budget friendly. NIDIA just spends more money on advs.
*Do try to invest the largest portion of your budget into a processor, graphics card and motherboard, preferably all 6th gen. This will eliminate the need to upgrade and additional expenses in the next dare I say 3-5 years (no joke).
Fyi my setup is the following:
					
						
Customizations:
										Chassis:  VYBE Windowed Compact Mid-Tower Case 
[ Orange on Black with ORANGE LED fans]
									
										
									
								
										Motherboard:  ASUS H110M-A
									
										Included
								
										Processor:  Intel
 Core
 i7 6700k 4.0GHz/4.2GHz Turbo QUAD Core CPU w/ Hyperthreading 8MB L3 Cache
									
										$275.00
								
										Processor Cooling:  [Closed Loop Liquid Cooling] MAINGEAR EPIC 120 Supercooler
									
										$89.00
								
										MAINGEAR Redline Overclocking Service:  Intel
 Turbo Boost Advanced Automatic Overclocking
									
										Included
								
										Memory:  16GB HyperX
 FURY
 DDR4- 2666 (2x8GB) [Dual Channel]
									
										$60.00
								
										Graphics Card:  NVIDIA
 GeForce
 GTX 1060 6GB GDDR5 with G-Sync 
[TUNED FOR VR ]
									
										$155.00
								
										Power Supply:  750W EVGA
 SuperNOVA 80 Plus Certified PSU - GTX Titan X SLI Ready
									
										$55.00
								
										Operating System Drive:  [SSD] 250GB Samsung
 850 EVO 
[520MB/s Sequential Reads] [FREE OS DRIVE UPGRADE ONLY!]
									
										
									
								
										Hard Drive Bay Two:  [HDD] 1TB Seagate Desktop HDD 7200rpm 64MB Cache
									
										$100.00
								
										Optical Drive One:  24X Dual Layer DVD-RW
									
										Included
								
										Audio:  On Board High Definition 8-Channel Audio
									
										Included
								
										Ethernet Adapter:  On-board Gigabit Ethernet
									
										Included
								
										Operating System:  Microsoft Windows 10 Professional 64-bit
									
										$50.00
								
										Security Software:  Free 1 Year Subscription! McAfee AntiVirus Plus
									
										Included
								
										The Final Finesse:  Designed, Manufactured, and Supported in the USA - Flawless Craftsmanship and Wire Management
									
										Included
								
										Angelic Service Warranty:  Lifetime Angelic Service Labor and Phone Support with 1 Year Comprehensive Warranty
									
										Included
								
				
					 
				
				
					
			
					 
				
				
					Product Subtotal:
				
				
					$1,683.00
				
				
					 
				
				
					 
				
			
					 
				
			  Yes, it is quite expensive but I also work on my PC so the components are not only for games but also video and audio editing and photoshop.
Similarly, consider this kind of setup that I have at work, Now it wont be a monster but it will be a desent rig.
Here it is:
Processor Intel Core i7 6700K, LGA1151, OEM
		Cooling DEEPCOOL Maelstrom 240T, S-2011v3/2011/1366/1156/1155/1151/1150
		Power ATX 650W AeroCool VP-650
		SSD  240 Gb Kingston HyperX Fury, 2.5", SATA III
		SSD  120 Gb Kingston HyperX Fury, 2.5", SATA III
		Graphics card PCI-E 4096Mb ASUS GTX 960 Turbo OC, GeForce 
		Motherboard Asus H110M-K D3, LGA1151
		RAM DDR-3 DIMM 16Gb/1866MHz PC14900 Kingston HyperX Fury Black, 2x8Gb Kit, BOX
Also more or less time proof except for the GPU.
P.S, When it comes to RAM, 4 is too little and 32 is an overkill, the best safe ground is 16GB. Ram cards are not expensive. (Opt for 8x2 over 4x4 slots), according to the technicians, 8x2GB is more efficient AND stable in terms of overload.
The 750W Power Supply is sufficient for any system with upto 2 Graphics card such as Titan x so going above 750W is a waste of money unless ur building a NASA PC.
	
		
	
	
		
		
			I won't be available unfortunately.  But you probably want to aim for something like an i7 6700k, 16gb ddr4, 250gb ssd or higher, gtx 970/980/980ti/1070.
The rest is pretty much up to you. If you want to pm me any choices I can have a look for you 
	
			
				 
		 
		
	 
Good rig, almost what I recommended but 1070? Really? That card is way way wayyy out fo his budget and will be for some time to come. 1060 is the new 960 GTX and will be in the market for some time and a fan fav like 960-980 have been.
Going for a 1070 in his case will raise the price by like 500$. In that case, he can just buy a Graphics card, put it on the table and look at it and get dirty with it. ))))))))