Ether mining

Hi there guys, I am new to the site and new to mining. thought of buying a ether mining tower at the speed of +-50mh/s just to try as a beginner. The spec are:

Windows 7
MB: Asus M5A99FX PRO R2.0
CPU: AMD Sempron 145 2.8Ghz
RAM: Kingston KHX16C10BIR/8 DDR3 8GB
GPUs: x4 Asus AMD Radeon 7970 3GB Direct CU + PCI-E Risers
PSU: Corsair AX1200 Gold Rated 1200W
SSD: Corsair Nova 30GB
Fans: x6 Evercool 120mm x 35mm

It is in a used condition, late 2013 with some updates, the price is 1100 euros.
If anyone can advise/help me, please let me know.
Oh, a bad fact; I live in London, 0,16kw

Thanks a lot.