I suggest 777coin ofcourse.
It can accept some altcoins too, it's established and known a long time now.
You can create a profile without KYC and they also offer instant withdrawal, use my signature if you want and it'll help me too!
Both 777 and Bitvest are good site to gamble, and do sport betting of any kind of bet. They are indeed a reputable site to play for, but if you want to try mo go for Cloudbet, they are awesome too and can be you favorite betting site. Always look for a site with good reputation, its for you security as well.