You can probably get an r9 280 over the r9 270x, I think it'd be within your budget.
You should get a decent CPU cooler if you don't have one already. The hyper 212 evo isn't horribly expensive and will probably be able to give you a decent overclock while keeping temperatures acceptable.
RAM is RAM. There's nothing different aside from price between brands, at least in my opinion. Maybe there might be warranty differences or something.
Seasonic is arguably the best PSU manufacturer.
CPU is stronger in single threaded applications, which is what most games are. The fx 8350/8320 will do fine in gaming, but the i5 is a stronger CPU when it comes to single threaded applications.
Ok thanks, it's very helpful for a newbee like me to get the thought behind deciding between different similar components. Thanks for your patience.
Obviously I can see that the GPU is better in your build and for £160 it's fine.. going with an Intel CPU was my original thought but got talked out of it because of the expense... but I'd be spending less on a mobo in your build compared to mine which allows more to spend on a better CPU.
So I'm interested in why the motherboard in my build is about £95 but yours is £65. What am I losing by spending £30 less?