Pc build - £500 - £750

i am thinking of buying or building a new pc

i will probbaly be getting it later this year

so far i have have thought about getting something with these parts

CPU:Amd X6 1055t / Intel i5 750
GPU:Nvidia gtx 260 / Ati 5770

along with 4gb ram - i am not sure about what other parts to get and i am open to suggestions

Id also like the pc to last a bit 3-5 years if possible

thanks for any help