Woody1999 :
lcp1109 :
with your budget I would go for a GTX 750, similar performance then r7 260x, but much lower power consumption.
http://www.amazon.co.uk/s/ref=sr_nr_n_0?fst=as%3Aoff&rh=n%3A340831031%2Cn%3A430524031%2Ck%3Agtx+750+ti&sort=price-asc-rank&keywords=gtx+750+ti&ie=UTF8&qid=1423399129&rnid=340832031
GTX 750 and GTX 750Ti are both very expensive for the performance they kick out. They're both designed to run as cool and as power efficient as possible, and sacrifice performance for that. I would take an R9 270 over both of these every day. It's not like you're going to be killing the earth with an R9 270, even if it uses more power than the GeForce options.
Woody
Well, I was comparing R7 260x and GTX 750.
Btw, the celeron g1620 will most likely bottleneck the R9 270.
And, he's not going to need only 10 pounds more to buy a R9 270. For example, the cheapest asus GTX 750 costs £91, but the cheapest asus R9 270 costs £119.