optimusprime1234 :
patrick47018 :
The R9 270 is a great choice and will offer quite a bit better performance than the other 2 choices
pairing it with a 6300 fx and 8 gigs of ram
8 gigs of RAM is a good choice, but the 6300 not so much, if going AMD at least go for an 8320, and then I recommend OC'ing