So my PC now is a c2d e4500 2.2ghz, 2gb ram ddr2, 8800gts 320mb and 200gb HDD. Later this year I want to upgrade to a r9 270 and a 1tb HDD. And even later I'll buy a fx6300, 4gb ram and another mobo. Also what PSU do you think I need. I am mainly going to be gaming on this PC. Thanks
Don't worry about bottleneck if you're upgrading the CPU later, just crank up the graphics to put more load on the GPU.
The R9270 doesn't need a massive amount of power, any seasonic / antec / xfx / EVGA 550w or greater would suffice