AMD athlon X4 760K 75€ (or AMD athlon x4 740 for 59€) the 760k needs 100 Watts doe, but it shoudl be fine, since the gpu does need 80 (250x), but it should e fine even with your hdd's (good PSU: Be quiet! BN142 400 watts for about 50€)
Asrock FM2A55M-HD+ Mainboard 32€
Crucial Ballistix sport 2x4GB 78€
sapphire r7 250x 83€
268€
this would run everything on low in 1080p withotu any problems, you could just get 1x4GB and safe some money there, but BF4 needs a bit more (maybe if you dont have anti viirus software and skype etc. in the backround running 4GB will be enough
if you realy just play on this resolution, then pick a r7 250 for 73€ from sapphire
I think the 250 doesnt need a power connector but the 250x does
prices were taken from amazon
the PSU should be fine there