Well you would be much better of building one. I got;

• i7 2600k,
• XFX Radeon 7850 with 2GB on-board memory,
• 16 GB of RAM/memory
• 1TB hard drive
• 780W PSU
• Zalman Z11 Plus case
• Gigabyte Z77 motherboard (or something like that)

This is around $780 USD (£500) The prices took along time getting, with me watching Ebay and multiple sites for a few months to get the best prices. All of it was new. I got this around a year and a bit ago. Back then to buy this sort of PC would have set you back $1050. Right now if you were to buy one I would think $900 ish. To buy the parts and build it yourself your looking at $600-650 USD. And that is a better price for a better PC. I skimped on my PSU and Motherboard slightly so you could maybe make a decent PC for $750 which is better than the one you listed above.

 

There is no difference in the time it will break whether you build it or not. As long as you build it properly it will last the same time if not longer. Also if a part does break you will know exactly what it is and be able to replace it.