Excellent PSU, but if you're going for the Antec 1200, you might as well get this case+PSU bundle click here & save £35 overall. Be aware of the case's size though - it is quite huge!
I would go with the HIS 4890 click here, as it has better cooling for around the same price as the XFX.
As for RAM, I'd get this: Corsair 4GB (2x2GB) DDR3 1600MHz/PC3-12800 XMS3 DHX Memory Kit click here.
Would definitely recommend an aftermarket cooler, especially if you are thinking of overclocking the CPU. G