General use PC

[LeRandomNoob]

I was planning out a build for my dad, who uses his failing laptop for general things like Skype, web browsing and occasional light gaming like SC2. However he would like it to be "future-proof" for as long as possible. I would appreciate any opinions on - http://uk.pcpartpicker.com/p/jXxLwP

I already have some spare parts that I was planning to use, 4GB of RAM, a 550w PSU, a 1GB video card, and a microATX case.

[Guest]

That spec is very unbalanced. You have a cheap cpu and a top end gpu. 
 
What is the 550W psu that you already have ? i.e make and model
 
The 4GB ram might be ok to reuse, although 8GB is usually the sweet spot for gaming. You could try the 4GB first before splashing out on a new kit.
 
The graphics card is waaaaaay overkill for 'light' gaming, especially on a 1080p monitor. Save your money and get a R9 280, or even a 270X. It is a simple job to update the gpu later on should your dad need something better.
 
What is your current make/model psu ? If it is a good brand then you can reuse it.
 

Also do you plan on overclocking the cpu for your dad ? If not then I suggest the non 'k' version cpu and a h97 or h81 board.
 
PCPartPicker part list / Price breakdown by merchant
 
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor  (£155.94 @ Aria PC) 
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler  (£24.25 @ Scan.co.uk) 
Motherboard: Gigabyte GA-Z97M-D3H Micro ATX LGA1150 Motherboard  (£79.16 @ Scan.co.uk) 
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1866 Memory  (£65.99 @ Ebuyer) 
Storage: Crucial MX100 256GB 2.5" Solid State Drive  (£76.80 @ Aria PC) 
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  (£38.70 @ Aria PC) 
Video Card: MSI Radeon R9 280 3GB TWIN FROZR Video Card  (£159.59 @ Overclockers.co.uk) 
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer  (£11.74 @ CCL Computers) 
Monitor: Asus VS238H-P 23.0" Monitor  (£139.56 @ CCL Computers) 
Wireless Network Adapter: TP-Link TL-WN951N 802.11b/g/n PCI Wi-Fi Adapter  (£18.83 @ CCL Computers) 
Other: Webcam (£24.99)
Other: SSD Mounting Bracket (£1.95)
Total: £797.50
Prices include shipping, taxes, and discounts when available