Yea thats a pretty good pc for it's money.
bear in mind it doesen't have an Operating System so you will have to buy and install that your self. It also doesen't say what sata the hard drive is. if it's a sata 1/2 then it's not worth getting. a sata 3 is good but if you are going for a i7 then i would suggest a PC with a sshd or ssd drive. They have a much higher transfer rate, so they will be much quicker.
Personaly, i would suggest this:
http://www.amazon.co.uk/ANKERMANN-Wi...7+computer+ssd
£200 more but defo worth it.
the prossesor has 4 cores + 8 hyper threads so it's basicly like a 8 core, just with 4 cores. graphics is GDDR5 insted of DDR3, 16GB DD3 ram instead of 8. It has a OS . And the hard drive is defo Sata 3, couldent find any PC's with sshd or ssd :/,