0.1 BTC free for mining-you can buy 9 th/s lifetime , offer limited time  https://seebit.io/?r=56086

NiceHash looks interesting.

Genesis Mining has an X11 contract that switches to the most profitable altcoin mining too.  My X11 contract from Genesis is doing very well but it is a two-year contract.

Setting up a mining rig in my home is not an option.  Electricity would have to be nearly free to make it viable.  The heat byproduct from the rig would only be welcome about 3 months out of the year.  The rest of the year the rig would need to be kept cool so that it did not heat the home.  Electricity for cooling is expensive here. 

While my goal is 33 TH/s, I do not plan to upgrade to that hash power in one transaction.  I will upgrade my hash power by one step then monitor it before deciding to continue.  I will be assessing the long-term viability and reliability of payouts.  There are various factors involved that include Genesis Mining itself and the feasibility of mining BTC.
At this point I am ready to take the next step to purchase more hash power but not go all the way to 33 TH/s in the next step.

Thanks for the comments and making me aware of NiceHash,
Mike