Is this a good business for ebay (PC Related)?

Right I have found a cheap website for custom built computers, powerful one and decent ones. If I bought them at around £550 per computer and then sold them at around £570 - £600 would this be a good business for ebay. It seems simple and people are always looking for a good deal and since the PC Would be £700 in the shops it seems only right to sell them cheaper.

For example:
AMD Athlon II X2 250 2MB (2 x 3.0 GHZ)
2GB DDR2 RAM
ATI Radeon HD 5770 - 1 GB
450W PSU
Microsoft Windows 7 Home Premium 64 BIT

Now I know DDR2 is getting old, but this still packs a punch what do you all think, good or bad idea?
 
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