Graphics Card £150

http://www.newegg.com/Product/Product.aspx?Item=N82E16814487128&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

this is what i would get, it has 4gb of ram, i would also consider the r9 380 or a 280x

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131673&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202137&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
 


There are AMD cards that run on a 430W PSU. - http://www.realhardtechx.com/index_archivos/Page362.htm
 


just change the country to UK at partpicker and you will know UK prices

 

Yes, but those that do are not significantly strong enough to be a worthwhile upgrade.
 


http://www.techspot.com/review/1006-the-witcher-3-benchmarks/page3.html
http://www.gamersnexus.net/game-bench/1905-gta-v-pc-fps-benchmark-graphics-cards
http://www.anandtech.com/bench/product/1044?vs=1043
Tom's Hardware - Benchmark 25 Watts per Index-Percent

the upgrade from R7 260x to GTX 960 is well wort it as those benchmark shows.