If pricing were part of it then everyone should have a low rating! Nothing being sold at retail will make a positive ROI even with free power.
And that makes any guide at this point useless. This might be the end of this portion of the forum considering it was the user coming here to discuss hardware that made it relevant. As time goes on there will be no more interest or users.
Why does it have to be about ROI?
Alot of people mine simply because they can...
It's not about the ohh shit ROI in 2 months to me.
It's about the ohh shit broke ROI 6 times over after a year to me.