How long till ethereum becomes POS? And what does that mean for small home miners like me?

I moved recently to a place where my work pays for electricity so I want to start mining right away to get a little extra income.
Can you suggest me some hardware to start?

So far I have this in mind:

mbo ASRock B85M Pro4, s1150
cpu Celeron G1820, 2700 MHz, Socket 1150
2x gpu XFX R9 390 8GB DDR5
ram Kingston 4GB, DDR3, 1333MHz
hdd 512 Gb
psu XFX 850 W

Is this okay for mining? Please suggest better/cheaper hardware.

I opted for only dual GPU because of the noise and heat, this rig will be at my home. I might buy more GPUs if find the noise tolerable...