1080 ti`s are best for resale value, rx580 is the fastest roi. two mutually exclusive categories.
I doubt the 1080ti has better resale than say a 1060.
I think when gpu mining slows or dies out, hopefully the person had got ROI and is just looking to make a profit off the sale. Regardless, it seems like there is a lot of options but I'm looking for a rig that can perform and mine consistently for ayleast 6 months. With increasing difficulties I wonder if there 1060 can keep up.
I'm also leaning towards a 6 card system.
nothing beats a bang for the buck rig and i think that isnt possible with the 1080Ti's (they are power hungry and need lots more capital -depends on your budget and risk level. Obviously the larger the capital the greater the risk especially for someone starting out small (think worst case scenario like Crypto mining goes into dark ages - would you like to have a 8000$ debt or a 4000$ debt. And during that time that you resell which do you think ppl will be more hesitant to buy a) a used card for say 250$ or b) a used card for $800?
I have used 1060's, 1070's and read about 1080Tis (dont own any yet).
I would make a 1060 rig if I can get my hands on Samsung memory cards again and again. The 1060s are rock solid (they dont mess around and just keep on mining. My 1070s are more of a diva so you need to really decide carefully. Then theres the Pascal RX cards that mine ethash & cryptonight like no ones business but also divas to setup.
I suggest starting out small and building up from there as opposed to jumping in the deep end right away. Just my 0.02$