EDIT: I've just realised this is the Bitcoin mining forum. I'd look into altcoins with your setup.

I have always found myself using this website instead...
https://whattomine.com/coins

Just double check the power consumption. Whattomine says each of my R9 380s uses 130w for Equihash but my whole system (i3-6100, 2 x R9 380, 2 sticks RAM, 650w PSU, M.2 SSD and no fans!) uses 380w. Thats just using the GPUs.
Incidently, when mining XMR using 2 R9 380s and my i3-6100 I only use 360w.

I bought a £10 monitor.
http://www.maplin.co.uk/p/13a-plug-in-energy-saving-monitor-n67fu?cmpid=ppc%3Abatteries___power%3Apla%3Agoogle&gclid=EAIaIQobChMI9s-wrp3H1AIVab7tCh1DaQCeEAQYASABEgKs0fD_BwE

I'm not too clued up on the different GPUs but I think the 7750 is quite efficient on power, but it probably wont hash very quickly.