After recent changes in Genesis-Mining and HashFlare which you probably already know about, i am concentrating my hash power in Hashing24. I do not use GM, most of my power is distributed to HashFlare and Hashing24. Although Hashing24 has stopped offering their contracts recently, after equipment upgrade, the contracts are available again for purchase. Also, they still offer lifetime contracts which are a bit higher in price but the reward is higher too. So personally i do not mind the price.
I am not saying that i am abandoning HF, it just seems more appropriate to me at this time.
Hashing24 has reinvest option from account balance which is great and offer instant withdrawals. Their mining reward is very close to the estimated reward calculated on ex. whattomine.com So actually you can check whether you are getting the appropriate amount of Bitcoins according to you mining contracts. This is also great.
If you would like to sign up, you can use the link below which in combination with the code below will give you a 4% discount.
Code is valid only for signups made by the link and for unlimited purchases until December 31st 2017, so be quick.
https://hashing24.com/?rid=53616c7465645f5f9954371a489f9ef02a927cfd498bd12c
code: 597UTVNE
Enjoy!